Merge branch 'master' of https://git.cern.ch/reps/AliRoot
[u/mrichter/AliRoot.git] / ITS / AliITStrackerSA.cxx
index 1724b85..ea8abeb 100644 (file)
  * provided "as is" without express or implied warranty.                  *
  **************************************************************************/
 
-////////////////////////////////////////////////////
-//  Stand alone tracker class                     //
-//  Origin:  Elisabetta Crescio                   //
-//  e-mail:  crescio@to.infn.it                   //
-//  tracks are saved as AliITStrackV2 objects     //
-////////////////////////////////////////////////////
-
-//#include <stdlib.h>
-#include "TArrayI.h"
+/* $Id$ */
+
+///////////////////////////////////////////////////////////
+//  Stand alone ITS tracker class                        //
+//  Origin:  Elisabetta Crescio - crescio@to.infn.it     //
+//  Updated: Francesco Prino    - prino@to.infn.it       //
+///////////////////////////////////////////////////////////
+
+#include <stdlib.h>
+
+#include <TArrayI.h>
 #include <TBranch.h>
-#include <TMath.h>
 #include <TObjArray.h>
 #include <TTree.h>
-#include "AliRun.h"
+
+#include "AliESDEvent.h"
+#include "AliESDVertex.h"
+#include "AliESDtrack.h"
+#include "AliITSVertexer.h"
 #include "AliITSclusterTable.h"
-#include "AliITSclusterV2.h"
-#include "AliITSgeom.h"
-#include "AliITSRiemannFit.h"
-#include "AliITStrackerSA.h"
+#include "AliITSRecPoint.h"
+#include "AliITSgeomTGeo.h"
 #include "AliITStrackSA.h"
-#include "AliITSVertexer.h"
-#include "AliITSVertex.h"
-
+#include "AliITStrackerSA.h"
+#include "AliITSReconstructor.h"
+#include "AliLog.h"
+#include "AliRun.h"
 
 ClassImp(AliITStrackerSA)
 
 //____________________________________________________________________________
-AliITStrackerSA::AliITStrackerSA():AliITStrackerV2(){
+AliITStrackerSA::AliITStrackerSA():AliITStrackerMI(),
+fPhiEstimate(0),
+fITSStandAlone(0),
+fLambdac(0),
+fPhic(0),
+fCoef1(0),
+fCoef2(0),
+fCoef3(0),
+fNloop(0),
+fPhiWin(0),
+fLambdaWin(0),
+fListOfTracks(0),
+fListOfSATracks(0),
+fITSclusters(0),
+fInwardFlag(0),
+fOuterStartLayer(0),
+fInnerStartLayer(5),
+fMinNPoints(0),
+fMinQ(0.),
+fCluCoord(0){
   // Default constructor
   Init();
 }
 //____________________________________________________________________________
-AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom, AliITSVertex *vert):AliITStrackerV2(geom) 
+AliITStrackerSA::AliITStrackerSA(const Char_t *geom):AliITStrackerMI(0),
+fPhiEstimate(0),
+fITSStandAlone(0),
+fLambdac(0),
+fPhic(0),
+fCoef1(0),
+fCoef2(0),
+fCoef3(0),
+fNloop(0),
+fPhiWin(0),
+fLambdaWin(0),
+fListOfTracks(0),
+fListOfSATracks(0),
+fITSclusters(0),
+fInwardFlag(0),
+fOuterStartLayer(0),
+fInnerStartLayer(5),
+fMinNPoints(0),
+fMinQ(0.),
+fCluCoord(0) 
 {
   // Standard constructor (Vertex is known and passed to this obj.)
-  Init();
-  fVert = vert;
-  fGeom = geom;
-}
-
-//______________________________________________________________________
-AliITStrackerSA::AliITStrackerSA(const AliITStrackerSA &trkr) : 
-                    AliITStrackerV2(trkr) {
-  // Copy constructor
-  // Copies are not allowed. The method is protected to avoid misuse.
-  Error("AliITStrackerSA","Copy constructor not allowed\n");
-}
+  if (geom) {
+    AliWarning("\"geom\" is actually a dummy argument !");
+  }
 
-//______________________________________________________________________
-AliITStrackerSA& AliITStrackerSA::operator=(const 
-                    AliITStrackerSA& /* trkr */){
-  // Assignment operator
-  // Assignment is not allowed. The method is protected to avoid misuse.
-  Error("= operator","Assignment operator not allowed\n");
-  return *this;
+  Init();
 }
 
 //____________________________________________________________________________
-AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom, AliITSVertexer *vertexer):AliITStrackerV2(geom) 
-{
-  // Standard constructor (Vertex is unknown - vertexer is passed to this obj)
-  Init();
-  fVertexer = vertexer;
-  fGeom = geom;
+AliITStrackerSA::~AliITStrackerSA(){
+  // destructor
+  if(fPhiWin)delete []fPhiWin;
+  if(fLambdaWin)delete []fLambdaWin;
+  fListOfTracks->Delete();
+  delete fListOfTracks;
+  fListOfSATracks->Delete();
+  delete fListOfSATracks;
+  if(fCluCoord){
+    for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++){
+      if(fCluCoord[i]){
+       fCluCoord[i]->Delete();
+       delete fCluCoord[i];
+      }
+    }
+    delete [] fCluCoord;
+  }
 }
 
 //____________________________________________________________________________
-AliITStrackerSA::AliITStrackerSA(AliITStrackerSA& tracker):AliITStrackerV2(){
-  // Copy constructor
-  fPhiEstimate = tracker.fPhiEstimate;
-  for(Int_t i=0;i<2;i++){
-    fPoint1[i]=tracker.fPoint1[i];
-    fPoint2[i]=tracker.fPoint2[i];
-    fPoint3[i]=tracker.fPoint3[i];
-    fPointc[i]=tracker.fPointc[i];
-  }
-  fLambdac = tracker.fLambdac;
-  fPhic = tracker.fPhic;
-  fCoef1 = tracker.fCoef1;
-  fCoef2 = tracker.fCoef2;
-  fCoef3 = tracker.fCoef3;
-  fNloop = tracker.fNloop;
-  fPhiWin = tracker.fPhiWin;
-  fLambdaWin = tracker.fLambdaWin;
-  if(tracker.fVertexer && tracker.fVert){
-    fVert = new AliITSVertex(*tracker.fVert);
+Int_t AliITStrackerSA::Clusters2Tracks(AliESDEvent *event){
+// This method is used to find and fit the tracks. By default the corresponding
+// method in the parent class is invoked. In this way a combined tracking
+// TPC+ITS is performed. If the flag fITSStandAlone is true, the tracking
+// is done in the ITS only. In the standard reconstruction chain this option
+// can be set via AliReconstruction::SetOption("ITS","onlyITS")
+  Int_t rc=0;
+
+  if(!fITSStandAlone){
+    rc=AliITStrackerMI::Clusters2Tracks(event);
   }
   else {
-    fVert = tracker.fVert;
+    AliDebug(1,"Stand Alone flag set: doing tracking in ITS alone\n");
   }
-  fVertexer = tracker.fVertexer;
-  fGeom = tracker.fGeom;
-  fFlagLoad = tracker.fFlagLoad;
-  fTable = tracker.fTable;
-}
-
-//____________________________________________________________________________
-AliITStrackerSA::~AliITStrackerSA(){
-  // destructor
-  // if fVertexer is not null, the AliITSVertex obj. is owned by this class
-  // and is deleted here
-  if(fVertexer){
-    if(fVert)delete fVert;
+  if(!rc){ 
+    rc=FindTracks(event,kFALSE);
+    Int_t nSPDcontr=0;
+    const AliESDVertex *spdv = event->GetPrimaryVertexSPD();
+    if(spdv) nSPDcontr = spdv->GetNContributors();
+    if(AliITSReconstructor::GetRecoParam()->GetSAUseAllClusters()==kTRUE && 
+       nSPDcontr<=AliITSReconstructor::GetRecoParam()->GetMaxSPDcontrForSAToUseAllClusters()) {
+      rc=FindTracks(event,kTRUE);
+    }
   }
-  fVert = 0;
-  fVertexer = 0;
-  fGeom = 0;
-  fFlagLoad = 0;
-  if(fPhiWin)delete []fPhiWin;
-  if(fLambdaWin)delete []fLambdaWin;
-  fTable =0;
+  return rc;
 }
 
 //____________________________________________________________________________
 void AliITStrackerSA::Init(){
   //  Reset all data members
     fPhiEstimate=0;
-    for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
+    for(Int_t i=0;i<2;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
     fLambdac=0;
     fPhic=0;
     fCoef1=0;
@@ -138,18 +160,30 @@ void AliITStrackerSA::Init(){
     fCoef3=0;
     fPointc[0]=0;
     fPointc[1]=0;
-    fVert = 0;
-    fVertexer = 0;
-    fGeom = 0;
-    fFlagLoad = 0;
-    SetWindowSizes();
-    fTable = 0;
-}
+    Int_t nLoops=AliITSReconstructor::GetRecoParam()->GetNLoopsSA();
+    if(nLoops==32){
+      SetFixedWindowSizes();
+    }else{
+      Double_t phimin=AliITSReconstructor::GetRecoParam()->GetMinPhiSA();
+      Double_t phimax=AliITSReconstructor::GetRecoParam()->GetMaxPhiSA();
+      Double_t lambmin=AliITSReconstructor::GetRecoParam()->GetMinLambdaSA();
+      Double_t lambmax=AliITSReconstructor::GetRecoParam()->GetMaxLambdaSA();
+      SetCalculatedWindowSizes(nLoops,phimin,phimax,lambmin,lambmax);
+    }
+    fMinQ=AliITSReconstructor::GetRecoParam()->GetSAMinClusterCharge();
+    fITSclusters = 0;
+    SetOuterStartLayer(1);
+    SetSAFlag(kFALSE);
+    fListOfTracks=new TClonesArray("AliITStrackMI",100);
+    fListOfSATracks=new TClonesArray("AliITStrackSA",100);
+    fCluCoord = 0;
+    fMinNPoints = 3;
+ }
 //_______________________________________________________________________
 void AliITStrackerSA::ResetForFinding(){
   //  Reset data members used in all loops during track finding
     fPhiEstimate=0;
-    for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
+    for(Int_t i=0;i<2;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
     fLambdac=0;
     fPhic=0;
     fCoef1=0;
@@ -157,696 +191,622 @@ void AliITStrackerSA::ResetForFinding(){
     fCoef3=0;
     fPointc[0]=0;
     fPointc[1]=0;
+    fListOfTracks->Clear();
+    fListOfSATracks->Clear();
 }
-//____________________________________________________________________________
-void AliITStrackerSA::FindTracks(TTree *clusterTree, TTree *out,Int_t evnumber,char *opt){
-
-  /**************************************************************************
-   * Options: to use only ITS execute FindTracks                            *
-   *          to define good tracks with 6 points out of 6 in the ITS write *
-   *          *opt="6/6". The default is *opt="6/6"                         *
-   *                                                                        * 
-   *                                                                        *
-   * Example: to execute function with only the ITS (no combined tracking   *
-   *          with TPC+ITS) and requiring 5/6 points to define a good track *
-   *          use: FindTracks(treein,treeout,evnumber,"5/6")                *
-   *          to execute combined tracking, before using FindTracks use     *
-   *          UseFoundTracksV2                                              *
-   *************************************************************************/
-
-  //options
-  TString choice(opt);
-  Bool_t sixpoints= choice.Contains("6/6");
-
-  //Fill array with cluster indices for each module
-  if(!fTable){
-    fTable = new AliITSclusterTable(fGeom,this);
-    fTable->FillArray(clusterTree,evnumber);
-  }
-  //Get primary vertex
-  if(fVertexer){
-    if(fVert)delete fVert;
-    fVert = fVertexer->FindVertexForCurrentEvent(evnumber);
-  }
-  else {
-    gAlice->GetEvent(evnumber);
-    if(!fVert){
-      Fatal("FindTracks","Vertex is missing\n");
-      return;
-    }
-  }
-  Double_t primaryVertex[3];
-  Double_t errorsprimvert[3];
-  fVert->GetXYZ(primaryVertex);
-  fVert->GetSigmaXYZ(errorsprimvert);
-  if(errorsprimvert[0]==0 || errorsprimvert[1]==0){
-    Warning("FindTracks","Set errors on vertex positions x and y at 0.0001");
-    errorsprimvert[0]=0.0001;
-    errorsprimvert[1]=0.0001;
-  }
-  fVert->PrintStatus();
 
-  SetEventNumber(evnumber);
-  if(GetFlagLoadedClusters()==0) LoadClusters(clusterTree);
-   
-//Fill tree for found tracks
-  AliITStrackV2* outrack=0;
-  TBranch* branch=out->Branch("Tracks","AliITStrackV2",&outrack,32000,0);
-  if (!branch) out->Branch("tracks","AliITStrackV2",&outrack,32000,3);
-  else branch->SetAddress(&outrack);
 
-  
-  Int_t firstmod[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++){
-    firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
-  }
-  // firstmod [i] number of the first module in the ITS layer i.
-    
-  AliITSlayer &layer=fgLayers[0];   // first layer
-  Int_t ntrack=0;
-  //loop on the different windows
-  for(Int_t nloop=0;nloop<fNloop;nloop++){
-    Int_t ncl=layer.GetNumberOfClusters();   
-    while(ncl--){ //loop starting from layer 0
-      ResetForFinding();
-      Int_t pflag=0;
-      AliITSclusterV2* cl = layer.GetCluster(ncl);
-      if(cl->IsUsed()==1) continue;     
-      Double_t x,y,z;
-      Int_t module = cl->GetDetectorIndex()+firstmod[0];
-      GetClusterGCoordinates(cl,module,x,y,z);
-      fPhic  = TMath::ATan2(y,x);
-      fLambdac = TMath::ATan2(z-primaryVertex[2],TMath::Sqrt((x-primaryVertex[0])*(x-primaryVertex[0])+(y-primaryVertex[1])*(y-primaryVertex[1])));    
-      fPhiEstimate = fPhic;
-      AliITStrackSA* trs = new AliITStrackSA();      
-      fPoint1[0]=primaryVertex[0];
-      fPoint1[1]=primaryVertex[1];
-      fPoint2[0]=x;
-      fPoint2[1]=y;
-      
-      Int_t nn[fGeom->GetNlayers()];//counter for clusters on each layer
-      for(Int_t i=0;i<fGeom->GetNlayers();i++){        nn[i]=0;}
-      nn[0] = SearchClusters(0,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
-      nn[1] = SearchClusters(1,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
-
-      if(nn[1]>0){
-       pflag=1;
-       fPoint3[0] = fPointc[0];
-       fPoint3[1] = fPointc[1];
-      }
-      nn[2] = SearchClusters(2,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
-      if(nn[1]==0 && nn[2]==0) pflag=0;
-      if(nn[2]!=0 && nn[1]!=0){ pflag=1; UpdatePoints();}
-      if(nn[2]!=0 && nn[1]==0){
-       pflag=1;
-       fPoint3[0]=fPointc[0];
-       fPoint3[1]=fPointc[1];
-      }
+//______________________________________________________________________
+Int_t AliITStrackerSA::FindTracks(AliESDEvent* event, Bool_t useAllClusters){
 
-      nn[3] = SearchClusters(3,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
-      pflag=1;
-      if(nn[3]!=0) UpdatePoints();
-      nn[4] = SearchClusters(4,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable); 
-      pflag=1;
-      if(nn[4]!=0) UpdatePoints();
-      nn[5] = SearchClusters(5,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable); 
-          
-
-      Int_t layOK=0;
-      Int_t numberofpoints;
-      if(sixpoints) numberofpoints=6;  //check of the candidate track
-      else numberofpoints=5;           //if track is good (with the required number        
-      for(Int_t nnp=0;nnp<fGeom->GetNlayers();nnp++){    //of points) it is written on file
-       if(nn[nnp]!=0) layOK+=1;
-      }
-      if(layOK>=numberofpoints){
-               AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert,opt);
-       if(tr2==0){
-         Int_t nct = trs->GetNumberOfClustersSA();
-         while(nct--){
-           Int_t index = trs->GetClusterIndexSA(nct);
-           AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
-           if(kl->IsUsed()==1) kl->Use();
-         }
-         continue;
-       }
-               outrack=tr2;  
-       out->Fill();
-       ntrack++;
-       Int_t nct = tr2->GetNumberOfClusters();
+// Track finder using the ESD object
 
-               while(nct--){
-         Int_t index = tr2->GetClusterIndex(nct);     
-         AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);      
-         if(kl->IsUsed()==0) kl->Use();
+  AliDebug(2,Form(" field is %f",event->GetMagneticField()));
+  AliDebug(2,Form("SKIPPING %d %d %d %d %d %d",ForceSkippingOfLayer(0),ForceSkippingOfLayer(1),ForceSkippingOfLayer(2),ForceSkippingOfLayer(3),ForceSkippingOfLayer(4),ForceSkippingOfLayer(5)));
 
+  if(!fITSclusters){
+    Fatal("FindTracks","ITS cluster tree is not accessed!!!\n Please use method SetClusterTree to pass the pointer to the tree\n");
+    return -1;
+  }
+  //Reads event and mark clusters of traks already found, with flag kITSin
+  Int_t nentr=event->GetNumberOfTracks();
+  if(!useAllClusters) {
+    while (nentr--) {
+      AliESDtrack *track=event->GetTrack(nentr);
+      if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
+       Int_t idx[12];
+       Int_t ncl = track->GetITSclusters(idx);
+       for(Int_t k=0;k<ncl;k++){
+         AliITSRecPoint* cll = (AliITSRecPoint*)GetCluster(idx[k]);
+         cll->SetBit(kSAflag);
        }
-      }        
-      else{
-       Int_t nct = trs->GetNumberOfClustersSA();
-       while(nct--){
-         Int_t index = trs->GetClusterIndexSA(nct);
-         AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
-         if(kl->IsUsed()==1) kl->Use();
+      }
+    }
+  }else{
+    while (nentr--) {
+      AliESDtrack *track=event->GetTrack(nentr);
+      if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
+       Int_t idx[12];
+       Int_t ncl = track->GetITSclusters(idx);
+       for(Int_t k=0;k<ncl;k++){
+         AliITSRecPoint* cll = (AliITSRecPoint*)GetCluster(idx[k]);
+         cll->ResetBit(kSAflag);
        }
       }
-      delete trs;
+    }
+  }
+  //Get primary vertex
+  Double_t primaryVertex[3];
+  event->GetVertex()->GetXYZ(primaryVertex);
+  //Creates TClonesArray with clusters for each layer. The clusters already used
+  //by AliITStrackerMI are not considered
+  Int_t nclusters[AliITSgeomTGeo::kNLayers]={0,0,0,0,0,0};
+  Int_t dmar[AliITSgeomTGeo::kNLayers]={0,0,0,0,0,0};
+  if (fCluCoord == 0) {
+    fCluCoord = new TClonesArray*[AliITSgeomTGeo::kNLayers];
+    for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++) {
+      fCluCoord[i]=0;
+    }
+  }
+  for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++){
+    AliITSlayer &layer=fgLayers[i];
+    if (!ForceSkippingOfLayer(i)) {
+      for(Int_t cli=0;cli<layer.GetNumberOfClusters();cli++){
+       AliITSRecPoint* cls = (AliITSRecPoint*)layer.GetCluster(cli);
+       if(cls->TestBit(kSAflag)==kTRUE) continue; //clusters used by TPC prol.
+       if(cls->GetQ()==0) continue; //fake clusters dead zones
+       if(i>1 && cls->GetQ()<=fMinQ) continue; // cut on SDD and SSD cluster charge
+       nclusters[i]++;
+      }
+    }
+    dmar[i]=0;
+    if(!fCluCoord[i]){
+      fCluCoord[i] = new TClonesArray("AliITSclusterTable",nclusters[i]);
+    }else{
+      fCluCoord[i]->Delete();
+      fCluCoord[i]->Expand(nclusters[i]);
+    }
+  }
 
-    }//end loop on clusters of layer1
+  for(Int_t ilay=0;ilay<AliITSgeomTGeo::GetNLayers();ilay++){
+    TClonesArray &clucoo = *fCluCoord[ilay];
+    AliITSlayer &layer=fgLayers[ilay];
+    if (!ForceSkippingOfLayer(ilay)) {
+      for(Int_t cli=0;cli<layer.GetNumberOfClusters();cli++){
+       AliITSRecPoint* cls = (AliITSRecPoint*)layer.GetCluster(cli);
+       if(cls->TestBit(kSAflag)==kTRUE) continue;
+       if(cls->GetQ()==0) continue;
+       if(ilay>1 && cls->GetQ()<=fMinQ) continue; 
+       Double_t phi=0;Double_t lambda=0;
+       Double_t x=0;Double_t y=0;Double_t z=0;
+       Double_t sx=0;Double_t sy=0;Double_t sz=0;
+       GetCoorAngles(cls,phi,lambda,x,y,z,primaryVertex);
+       GetCoorErrors(cls,sx,sy,sz);
+       new (clucoo[dmar[ilay]]) AliITSclusterTable(x,y,z,sx,sy,sz,phi,lambda,cli);
+       dmar[ilay]++;
+      }
+    }
+    fCluCoord[ilay]->Sort();
+  }
+   
+  // track counter
+  Int_t ntrack=0;
 
-  }//end loop2
+  static Int_t nClusLay[AliITSgeomTGeo::kNLayers];//counter for clusters on each layer
+  Int_t startLayForSeed=0;
+  Int_t lastLayForSeed=fOuterStartLayer;
+  Int_t nSeedSteps=lastLayForSeed-startLayForSeed;
+  Int_t seedStep=1;
+  if(fInwardFlag){
+    startLayForSeed=AliITSgeomTGeo::GetNLayers()-1;
+    lastLayForSeed=fInnerStartLayer;
+    nSeedSteps=startLayForSeed-lastLayForSeed;
+    seedStep=-1;
+  }
 
-  //if 5/6 points are required, second loop starting 
-  //from second layer, to find tracks with point of 
-  //layer 1 missing
-   
-  if(!sixpoints){
-    //   counter for clusters on each layer  
-    Int_t *nn = new Int_t[fGeom->GetNlayers()-1];      
-    for(Int_t nloop=0;nloop<fNloop;nloop++){
-      AliITSlayer &layer2=fgLayers[1]; //loop on layer 2
-      Int_t ncl2=layer2.GetNumberOfClusters();
-      while(ncl2--){ //loop starting from layer 2
-       ResetForFinding();
-       Int_t pflag=0;
-       AliITSclusterV2* cl = layer2.GetCluster(ncl2);
-       if(cl->IsUsed()==1) continue;
-       Double_t x,y,z;
-       Int_t module = cl->GetDetectorIndex()+firstmod[1];
-       GetClusterGCoordinates(cl,module,x,y,z);
-       fPhic  = TMath::ATan2(y,x); 
-       fLambdac = TMath::ATan2(z-primaryVertex[2],TMath::Sqrt((x-primaryVertex[0])*(x-primaryVertex[0])+(y-primaryVertex[1])*(y-primaryVertex[1])));       
-
-       fPhiEstimate = fPhic;
-       AliITStrackSA* trs = new AliITStrackSA(); 
-     
-       fPoint1[0]=primaryVertex[0];
-       fPoint1[1]=primaryVertex[1];
-       fPoint2[0]=x;
-       fPoint2[1]=y;
-   
-       for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++)nn[kk] = 0;
-       for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++){
-         nn[kk] = SearchClusters(kk+1,fPhiWin[nloop],fLambdaWin[nloop],
-                   trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
-         if(nn[kk]==0)break;
-         if(kk>0){
-           UpdatePoints();
-           pflag = 1;
+  // loop on minimum number of points
+  for(Int_t iMinNPoints=AliITSgeomTGeo::GetNLayers(); iMinNPoints>=fMinNPoints; iMinNPoints--) {
+
+    // loop on starting layer for track finding 
+    for(Int_t iSeedLay=0; iSeedLay<=nSeedSteps; iSeedLay++) {
+      Int_t theLay=startLayForSeed+iSeedLay*seedStep;
+      if(ForceSkippingOfLayer(theLay)) continue;
+      Int_t minNPoints=iMinNPoints-theLay;
+      if(fInwardFlag) minNPoints=iMinNPoints-(AliITSgeomTGeo::GetNLayers()-1-theLay);
+      for(Int_t i=theLay+1;i<AliITSgeomTGeo::GetNLayers();i++)
+       if(ForceSkippingOfLayer(i)) 
+         minNPoints--;
+      if(minNPoints<fMinNPoints) continue;
+
+      // loop on phi and lambda window size
+      for(Int_t nloop=0;nloop<fNloop;nloop++){
+       Int_t nclTheLay=fCluCoord[theLay]->GetEntries();
+       while(nclTheLay--){ 
+         ResetForFinding();
+         Bool_t useRP=SetFirstPoint(theLay,nclTheLay,primaryVertex);
+         if(!useRP) continue;      
+         AliITStrackSA trs;
+           
+         Int_t pflag=0;            
+         Int_t kk;
+         for(kk=0;kk<AliITSgeomTGeo::GetNLayers();kk++) nClusLay[kk] = 0;
+           
+         kk=0;
+         nClusLay[kk] = SearchClusters(theLay,fPhiWin[nloop],fLambdaWin[nloop],
+                                       &trs,primaryVertex[2],pflag);
+         Int_t nextLay=theLay+seedStep;
+         Bool_t goon=kTRUE;
+         if(nextLay<0 || nextLay == 6) goon = kFALSE;
+         while(goon){
+           kk++;
+           nClusLay[kk] = SearchClusters(nextLay,fPhiWin[nloop],fLambdaWin[nloop],
+                                           &trs,primaryVertex[2],pflag);
+           if(nClusLay[kk]!=0){
+             pflag=1;
+             if(kk==1) {
+               fPoint3[0]=fPointc[0];
+               fPoint3[1]=fPointc[1];
+             } else {
+               UpdatePoints();
+             }
+           }
+           nextLay+=seedStep;
+           if(nextLay<0 || nextLay==6) goon=kFALSE;
          }
-       }
-       Int_t fl=0;
-       for(Int_t nnp=0;nnp<fGeom->GetNlayers()-1;nnp++){
-         if(nn[nnp]!=0) fl+=1;
-       }
-       if(fl>=5){  // 5/6       
-         AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert,opt);
-         if(tr2==0){
-           Int_t nct = trs->GetNumberOfClustersSA();
-           while(nct--){
-             Int_t index = trs->GetClusterIndexSA(nct);
-             AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
-             if(kl->IsUsed()==1) kl->Use();
+
+           
+         Int_t layOK=0;
+         if(!fInwardFlag){
+           for(Int_t nnp=0;nnp<AliITSgeomTGeo::GetNLayers()-theLay;nnp++){
+             if(nClusLay[nnp]!=0) layOK+=1;
+           }
+         }else{
+           for(Int_t nnp=theLay; nnp>=0; nnp--){
+             if(nClusLay[nnp]!=0) layOK+=1;
            }
-           continue;
          }
-         outrack=tr2;
-         out->Fill();
-         Int_t nct = tr2->GetNumberOfClusters();
-         while(nct--){
-           Int_t index = tr2->GetClusterIndex(nct);     
-           AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
-           if(kl==0) continue;
-           if(kl->IsUsed()==0) kl->Use();
+         if(layOK>=minNPoints){ 
+           AliDebug(2,Form("---NPOINTS: %d; MAP: %d %d %d %d %d %d\n",layOK,nClusLay[0],nClusLay[1],nClusLay[2],nClusLay[3],nClusLay[4],nClusLay[5]));
+           AliITStrackV2* tr2 = 0;
+           tr2 = FitTrack(&trs,primaryVertex);
+           if(!tr2){ 
+             continue;
+           }
+           AliDebug(2,Form("---NPOINTS fit: %d\n",tr2->GetNumberOfClusters()));
+             
+           StoreTrack(tr2,event,useAllClusters);
+           ntrack++;
+             
+         }   
+         
+       }//end loop on clusters of theLay
+      } //end loop on window sizes
+    } //end loop on theLay
+  }//end loop on min points
+
+  // search for 1-point tracks in SPD, only for cosmics
+  // (A.Dainese 21.03.08)
+  if(AliITSReconstructor::GetRecoParam()->GetSAOnePointTracks() && 
+     TMath::Abs(event->GetMagneticField())<0.01) {
+    Int_t outerLayer=1; // only SPD
+    for(Int_t innLay=0; innLay<=TMath::Min(1,fOuterStartLayer); innLay++) {
+      //   counter for clusters on each layer  
+
+      for(Int_t nloop=0;nloop<fNloop;nloop++){
+       Int_t nclInnLay=fCluCoord[innLay]->GetEntries();
+       while(nclInnLay--){ //loop starting from layer innLay
+         ResetForFinding();
+         Bool_t useRP=SetFirstPoint(innLay,nclInnLay,primaryVertex);
+         if(!useRP) continue;
+         AliITStrackSA trs;
+           
+         Int_t pflag=0;            
+         Int_t kk;
+         for(kk=0;kk<AliITSgeomTGeo::GetNLayers();kk++) nClusLay[kk] = 0;
+         
+         kk=0;
+         nClusLay[kk] = SearchClusters(innLay,fPhiWin[nloop],fLambdaWin[nloop],
+                                 &trs,primaryVertex[2],pflag);
+         for(Int_t nextLay=innLay+1; nextLay<=outerLayer; nextLay++) {
+           kk++;
+           nClusLay[kk] = SearchClusters(nextLay,fPhiWin[nloop],fLambdaWin[nloop],
+                                   &trs,primaryVertex[2],pflag);
+           if(nClusLay[kk]!=0){
+             pflag=1;
+             if(kk==1) {
+               fPoint3[0]=fPointc[0];
+               fPoint3[1]=fPointc[1];
+             } else {
+               UpdatePoints();
+             }
+           }
          }
-       }       
-       else{
-         Int_t nct = trs->GetNumberOfClustersSA();
-         while(nct--){
-           Int_t index = trs->GetClusterIndexSA(nct);
-           AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
-           if(kl==0) continue;
-           if(kl->IsUsed()==1) kl->Use();
+         
+         Int_t layOK=0;
+         for(Int_t nnp=0;nnp<AliITSgeomTGeo::GetNLayers()-innLay;nnp++){
+           if(nClusLay[nnp]!=0) layOK+=1;
          }
-       }
-       delete trs;
-      }//end loop on clusters of layer2
-    }
-    delete []nn;
-  }  //end opt="5/6"  
-
-
-  UnloadClusters();
-}
-//_______________________________________________________________________
-void AliITStrackerSA::UseFoundTracksV2(Int_t evnum,TTree* treev2, TTree* clustertree){
-  // Marks as used clusters belonging to tracks found with V2 TPC+ITS tracking
-  if(!fTable){
-    fTable = new AliITSclusterTable(fGeom,this);
-    fTable->FillArray(clustertree,evnum);
-  }
-  LoadClusters(clustertree);
-  SetFlagLoadedClusters(1);
-
-  TBranch* bra = (TBranch*)treev2->GetBranch("tracks");
-  if(!bra) Warning("UseFoundTracksV2","No branch for track tree");
-  AliITStrackV2* ttrrt = new AliITStrackV2;
-  bra->SetAddress(&ttrrt);
-
-  for(Int_t nj=0;nj<treev2->GetEntries();nj++){
-    treev2->GetEvent(nj);
-    Int_t ncl = ttrrt->GetNumberOfClusters();
-    for(Int_t k=0;k<ncl;k++){
-      Int_t index = ttrrt->GetClusterIndex(k);
-      AliITSclusterV2* clui = (AliITSclusterV2*)GetCluster(index);
-      if(clui->IsUsed()==0) clui->Use();  
-    }
-  }
-  delete ttrrt;
+         if(layOK==1) {
+           AliDebug(2,Form("----NPOINTS: %d; MAP: %d %d %d %d %d %d\n",layOK,nClusLay[0],nClusLay[1],nClusLay[2],nClusLay[3],nClusLay[4],nClusLay[5]));
+           AliITStrackV2* tr2 = 0;
+           Bool_t onePoint = kTRUE;
+           tr2 = FitTrack(&trs,primaryVertex,onePoint);
+           if(!tr2){
+             continue;
+           }
+           AliDebug(2,Form("----NPOINTS fit: %d\n",tr2->GetNumberOfClusters()));
+           
+           StoreTrack(tr2,event,useAllClusters);
+           ntrack++;
+           
+         }   
+         
+       }//end loop on clusters of innLay
+      } //end loop on window sizes
+      
+    } //end loop on innLay
+  } // end search 1-point tracks
+  
+  if(!useAllClusters) AliInfo(Form("Number of found tracks: %d",event->GetNumberOfTracks()));
+  ResetForFinding();
+  return 0;
 
 }
-
 //________________________________________________________________________
 
-AliITStrackV2* AliITStrackerSA::FitTrack(AliITStrackSA* tr,Double_t *primaryVertex,Double_t *errorsprimvert,char *opt){
-  //fit of the found track
+AliITStrackV2* AliITStrackerSA::FitTrack(AliITStrackSA* tr,Double_t *primaryVertex,Bool_t onePoint) {
+  //fit of the found track (most general case, also <6 points, layers missing)
+  // A.Dainese 16.11.07 
 
-//options
-  TString choice(opt);
-  Bool_t sixpoints= choice.Contains("6/6");
   
-  Int_t firstmod[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++){
-    firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
-  }  
-  TObjArray* listoftracks=new TObjArray(0,0);
-  AliITStrackV2* otrack2;
-  Int_t nclusters = tr->GetNumberOfClustersSA();
-  TObjArray** listlayer = new TObjArray*[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++){
-    listlayer[i] = new TObjArray(0,0);
+  const Int_t kMaxClu=AliITStrackSA::kMaxNumberOfClusters;
+
+  static Int_t firstmod[AliITSgeomTGeo::kNLayers];  
+  static Int_t clind[AliITSgeomTGeo::kNLayers][kMaxClu];
+  static Int_t clmark[AliITSgeomTGeo::kNLayers][kMaxClu];
+  static Int_t end[AliITSgeomTGeo::kNLayers];
+  static Int_t indices[AliITSgeomTGeo::kNLayers];
+
+  static AliITSRecPoint *listlayer[AliITSgeomTGeo::kNLayers][kMaxClu];
+
+  for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++) {
+    firstmod[i]=AliITSgeomTGeo::GetModuleIndex(i+1,1,1);
+    end[i]=0;
+    for(Int_t j=0;j<kMaxClu; j++){
+      clind[i][j]=0;
+      clmark[i][j]=0;
+      listlayer[i][j]=0;
+   }
   }
-
-  TArrayI clind0(20);
-  TArrayI clind1(20);
-  TArrayI clind2(20);
-  TArrayI clind3(20);
-  TArrayI clind4(20);
-  TArrayI clind5(20);
-
-  Int_t nnn[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++)nnn[i]=0;
   
+
+  Int_t nclusters = tr->GetNumberOfClustersSA();
   for(Int_t ncl=0;ncl<nclusters;ncl++){
-    Int_t index = tr->GetClusterIndexSA(ncl);   
-    AliITSclusterV2* cl = (AliITSclusterV2*)GetCluster(index);
-    if(cl->IsUsed()==1) cl->Use();
+    Int_t index = tr->GetClusterIndexSA(ncl); 
+    AliITSRecPoint* cl = (AliITSRecPoint*)GetCluster(index);
     Int_t lay = (index & 0xf0000000) >> 28;
-    if(lay==0) { listlayer[0]->AddLast(cl); clind0[nnn[0]]=index;nnn[0]++;}
-    if(lay==1) { listlayer[1]->AddLast(cl); clind1[nnn[1]]=index;nnn[1]++;}
-    if(lay==2) { listlayer[2]->AddLast(cl); clind2[nnn[2]]=index;nnn[2]++;}
-    if(lay==3) { listlayer[3]->AddLast(cl); clind3[nnn[3]]=index;nnn[3]++;}
-    if(lay==4) { listlayer[4]->AddLast(cl); clind4[nnn[4]]=index;nnn[4]++;}
-    if(lay==5) { listlayer[5]->AddLast(cl); clind5[nnn[5]]=index;nnn[5]++;}    
+    Int_t nInLay=end[lay];
+    listlayer[lay][nInLay]=cl;
+    clind[lay][nInLay]=index;
+    end[lay]++;
   }
 
-  Int_t end[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++){
-    if(listlayer[i]->GetEntries()==0) end[i]=1;
-    else end[i]=listlayer[i]->GetEntries();
+  for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
+    for(Int_t ncl=0;ncl<tr->GetNumberOfMarked(nlay);ncl++){
+      Int_t mark = tr->GetClusterMark(nlay,ncl);
+      clmark[nlay][ncl]=mark;
+    }
   }
 
-  for(Int_t l1=0;l1<end[0];l1++){//loop on layer 1
-    AliITSclusterV2* cl0 = (AliITSclusterV2*)listlayer[0]->At(l1); 
-    TVector3** recp = new TVector3*[3];
-    TVector3** errs = new TVector3*[3];
-    recp[0] = new TVector3(primaryVertex[0],primaryVertex[1],primaryVertex[2]);
-    errs[0] = new TVector3(errorsprimvert[0],errorsprimvert[1],errorsprimvert[2]);
-    Double_t x1,y1,z1,sx1,sy1,sz1;
-    Double_t x2,y2,z2,sx2,sy2,sz2;
-    AliITSclusterV2* p1=0;
-    AliITSclusterV2* p2=0;
-
-    for(Int_t l2=0;l2<end[1];l2++){//loop on layer 2
-      AliITSclusterV2* cl1 = (AliITSclusterV2*)listlayer[1]->At(l2);    
-      for(Int_t l3=0;l3<end[2];l3++){  //loop on layer 3
-       AliITSclusterV2* cl2 = (AliITSclusterV2*)listlayer[2]->At(l3);
-
-       if(cl0==0 && cl1!=0) {
-         p2 = cl2;
-         p1=cl1;
-               
-       }
-       if(cl0!=0 && cl1==0){
-         p1=cl0;
-         p2=cl2;
-       }
-       if(cl0!=0 && cl1!=0){
-         p1=cl0;
-         p2=cl1;
-       }
-       Int_t module1 = p1->GetDetectorIndex()+firstmod[0];
-       Int_t module2 = p2->GetDetectorIndex()+firstmod[1];
-       GetClusterGCoordinates(p1,module1,x1,y1,z1);
-       GetClusterGCoordinates(p2,module2,x2,y2,z2);
-       GetClusterGErrors(p1,module1,sx1,sy1,sz1);
-       GetClusterGErrors(p2,module2,sx2,sy2,sz2);
-       Double_t phi1=TMath::ATan2(y1,x1);
-       recp[1] = new TVector3(x1,y1,z1);
-       errs[1] = new TVector3(sx1,sy1,sz1);
-       recp[2] = new TVector3(x2,y2,z2);
-       errs[2] = new TVector3(sx2,sy2,sz2);
-       
-       //fit on the Riemann sphere
-       Float_t seed1,seed2,seed3;
-       AliITSRiemannFit fit;
-       Int_t rf = fit.FitHelix(3,recp,errs,seed1,seed2,seed3); //this gives phi,tgl,curvature to start Kalman Filter
-       if(rf==0) continue;  
-       Double_t phi=seed1;
-       Double_t tgl=seed2;
-       
-       if(phi1>0){ 
-         if(seed1>-TMath::Pi() && seed1<-0.5*TMath::Pi()){
-           phi=seed1+1.5*TMath::Pi();
-           tgl=seed2; 
-         }
-         if(seed1>-0.5*TMath::Pi() && seed1<0.5*TMath::Pi()){
-           phi=seed1+0.5*TMath::Pi();
-           tgl=(-1)*seed2; 
-         }
-         if(seed1>0.5*TMath::Pi() && seed1<TMath::Pi()){
-           phi=seed1-0.5*TMath::Pi();
-           tgl=seed2; 
-         }
-       }      
-       if(phi1<0){
-         if(seed1>-TMath::Pi() && seed1<-0.5*TMath::Pi()){
-           phi=seed1+0.5*TMath::Pi();
-           tgl=(-1)*seed2; 
-         }
-         if(seed1>-0.5*TMath::Pi() && seed1<0.5*TMath::Pi()){
-           phi=seed1-0.5*TMath::Pi();
-           tgl=seed2; 
-         }
-         if(seed1>0.5*TMath::Pi() && seed1<TMath::Pi()){
-           phi=seed1-1.5*TMath::Pi();
-           tgl=(-1)*seed2; 
-           }
-         }
-       
-       Int_t layer,ladder,detector;
-       fGeom->GetModuleId(module1,layer,ladder,detector);
-       Float_t yclu1 = p1->GetY();
-       Float_t zclu1 = p1->GetZ();
-       Double_t cv=Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
-             
-       for(Int_t l4=0;l4<end[3];l4++){ //loop on layer 4   
-         AliITSclusterV2* cl3 = (AliITSclusterV2*)listlayer[3]->At(l4);
-         for(Int_t l5=0;l5<end[4];l5++){ //loop on layer 5
-           AliITSclusterV2* cl4 = (AliITSclusterV2*)listlayer[4]->At(l5);
-           for(Int_t l6=0;l6<end[5];l6++){ //loop on layer 6  
-             AliITSclusterV2* cl5 = (AliITSclusterV2*)listlayer[5]->At(l6);
-             AliITStrackSA* trac = new AliITStrackSA(layer,ladder,detector,yclu1,zclu1,phi,tgl,cv,1);
-                             
-             if(cl5!=0) trac->AddClusterV2(5,(clind5[l6] & 0x0fffffff)>>0);
-             if(cl4!=0) trac->AddClusterV2(4,(clind4[l5] & 0x0fffffff)>>0);
-             if(cl3!=0) trac->AddClusterV2(3,(clind3[l4] & 0x0fffffff)>>0);
-             if(cl2!=0) trac->AddClusterV2(2,(clind2[l3] & 0x0fffffff)>>0);
-             if(cl1!=0) trac->AddClusterV2(1,(clind1[l2] & 0x0fffffff)>>0);
-             if(cl0!=0) trac->AddClusterV2(0,(clind0[l1] & 0x0fffffff)>>0);
-           
-             //fit with Kalman filter using AliITStrackerV2::RefitAt()
-         
-             AliITStrackV2* ot = new AliITStrackV2(*trac);
-             
-             ot->ResetCovariance();
-             ot->ResetClusters();
-             
-             if(RefitAt(49.,ot,trac)){ //fit from layer 1 to layer 6
-
-               otrack2 = new AliITStrackV2(*ot);
-               otrack2->ResetCovariance(); 
-               otrack2->ResetClusters();
-               //fit from layer 6 to layer 1
-               if(RefitAt(3.7,otrack2,ot)) listoftracks->AddLast(otrack2);
-                             
-             }       
-         
-             delete ot;
-             delete trac;
-           }//end loop layer 6
-         }//end loop layer 5
-       }//end loop layer 4
-       
-       for(Int_t i=1;i<3;i++){
-         delete recp[i];
-         delete errs[i];
-       }
-      }//end loop layer 3
-    }//end loop layer 2        
-    delete recp[0];
-    delete errs[0];
-    delete[] recp;
-    delete[] errs;    
-  }//end loop layer 1
 
-  Int_t dim=listoftracks->GetEntries();
-  if(dim==0){
-    delete listoftracks;
-    for(Int_t i=0;i<fGeom->GetNlayers();i++){
-      delete listlayer[i];
+  Int_t firstLay=-1,secondLay=-1;
+  for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++) {
+    if(end[i]==0) {
+      end[i]=1;
+    }else{
+      if(firstLay==-1) {
+       firstLay=i;
+      } else if(secondLay==-1) {
+       secondLay=i;
+      }
     }
-    delete listlayer;
-    return 0;
   }
 
-  AliITStrackV2* otrack =(AliITStrackV2*)FindTrackLowChiSquare(listoftracks,dim);
-
-  if(otrack==0) return 0;
-  Int_t indexc[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++) indexc[i]=0;
-  for(Int_t nind=0;nind<otrack->GetNumberOfClusters();nind++){
-    indexc[nind] = otrack->GetClusterIndex(nind);
-  }      
-  AliITSclusterV2* cl0 = (AliITSclusterV2*)GetCluster(indexc[0]);
-  AliITSclusterV2* cl1 = (AliITSclusterV2*)GetCluster(indexc[1]);     
-  AliITSclusterV2* cl2 = (AliITSclusterV2*)GetCluster(indexc[2]);     
-  AliITSclusterV2* cl3 = (AliITSclusterV2*)GetCluster(indexc[3]);
-  AliITSclusterV2* cl4 = (AliITSclusterV2*)GetCluster(indexc[4]);
-  Int_t labl[3]={-1,-1,-1};
-  if(otrack->GetNumberOfClusters()==fGeom->GetNlayers()){
-    AliITSclusterV2* cl5 = (AliITSclusterV2*)GetCluster(indexc[5]);
-    labl[0]=cl5->GetLabel(0);
-    labl[1]=cl5->GetLabel(1);
-    labl[2]=cl5->GetLabel(2);
-  }
-  if(otrack->GetNumberOfClusters()==(fGeom->GetNlayers()-1)){
-    labl[0]=-1;
-    labl[1]=-1;
-    labl[2]=-1;
-  }
-  Int_t numberofpoints;
-  if(sixpoints) numberofpoints=6;
-  else numberofpoints=5;
-  Int_t label =  Label(cl0->GetLabel(0),cl1->GetLabel(0), 
-                      cl2->GetLabel(0),cl3->GetLabel(0),
-                      cl4->GetLabel(0),labl[0],
-                      cl0->GetLabel(1),cl1->GetLabel(1),
-                      cl2->GetLabel(1),cl3->GetLabel(1),
-                      cl4->GetLabel(1),labl[1],
-                      cl0->GetLabel(2),cl1->GetLabel(2),
-                      cl2->GetLabel(2),cl3->GetLabel(2),
-                      cl4->GetLabel(2),labl[2],numberofpoints);
-  
-  otrack->SetLabel(label);  
-  delete listoftracks;
-  for(Int_t i=0;i<fGeom->GetNlayers();i++){
-    delete listlayer[i];
-  }
-  delete listlayer; 
-  return otrack;
+  if(firstLay==-1 || (secondLay==-1 && !onePoint)) return 0;
+  TClonesArray &arrMI= *fListOfTracks;
+  TClonesArray &arrSA= *fListOfSATracks;
+  Int_t nFoundTracks=0;
+
+
+  for(Int_t l0=0;l0<end[0];l0++){ //loop on layer 1
+    indices[0]=l0;
+    for(Int_t l1=0;l1<end[1];l1++){ //loop on layer 2
+      indices[1]=l1;
+      for(Int_t l2=0;l2<end[2];l2++){  //loop on layer 3
+       indices[2]=l2;
+        for(Int_t l3=0;l3<end[3];l3++){ //loop on layer 4   
+         indices[3]=l3;
+          for(Int_t l4=0;l4<end[4];l4++){ //loop on layer 5
+           indices[4]=l4;
+            for(Int_t l5=0;l5<end[5];l5++){ //loop on layer 6  
+             indices[5]=l5;
+
+             // estimate curvature from 2 innermost points (or innermost point + vertex)
+
+             Int_t iFirstLay=indices[firstLay];
+             Int_t mrk1=clmark[firstLay][iFirstLay];
+
+             AliITSRecPoint* p1=(AliITSRecPoint*)listlayer[firstLay][iFirstLay];
+             Int_t module1 = p1->GetDetectorIndex()+firstmod[firstLay]; 
+             Int_t layer,ladder,detector;
+             AliITSgeomTGeo::GetModuleId(module1,layer,ladder,detector);
+             Double_t yclu1 = p1->GetY();
+             Double_t zclu1 = p1->GetZ();
+
+             Double_t x1,y1,z1;
+             Double_t x2,y2,z2;
+             Double_t cv=0,tgl2=0,phi2=0;
+             AliITSclusterTable* arr1 = (AliITSclusterTable*)GetClusterCoord(firstLay,mrk1);
+             x1 = arr1->GetX();
+             y1 = arr1->GetY();
+             z1 = arr1->GetZ();
+
+             if(secondLay>0) {
+               Int_t iSecondLay=indices[secondLay];          
+               Int_t mrk2=clmark[secondLay][iSecondLay];
+               AliITSclusterTable* arr2 = (AliITSclusterTable*)GetClusterCoord(secondLay,mrk2);
+               x2 = arr2->GetX();
+               y2 = arr2->GetY();
+               z2 = arr2->GetZ();
+               cv = Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
+               tgl2 = (z2-z1)/TMath::Sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
+               phi2 = TMath::ATan2((y2-y1),(x2-x1));
+             } else { // special case of 1-point tracks, only for cosmics (B=0)
+               x2 = primaryVertex[0];
+               y2 = primaryVertex[1];
+               z2 = primaryVertex[2];
+               cv = 0;
+               tgl2 = (z1-z2)/TMath::Sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
+               phi2 = TMath::ATan2((y1-y2),(x1-x2));
+             }
+
+             // create track and attach it the RecPoints
+              AliITStrackSA trac(layer,ladder,detector,yclu1,zclu1,phi2,tgl2,cv,1);
+             for(Int_t iLay=5; iLay>=0; iLay--){
+               Int_t iInLay=indices[iLay];
+               AliITSRecPoint* cl=(AliITSRecPoint*)listlayer[iLay][iInLay];
+               if(cl!=0){
+                 trac.AddClusterV2(iLay,(clind[iLay][iInLay] & 0x0fffffff)>>0);
+                 trac.AddClusterMark(iLay,clmark[iLay][iInLay]);
+               }
+             }
+
+              //fit with Kalman filter using AliITStrackerMI::RefitAt()
+             AliITStrackSA ot(trac);
+
+              ot.ResetCovariance(10.);
+              ot.ResetClusters();
+              
+             // Propagate inside the innermost layer with a cluster 
+             if(ot.Propagate(ot.GetX()-0.1*ot.GetX())) {
+
+               if(RefitAt(AliITSRecoParam::GetrInsideITSscreen(),&ot,&trac)){ //fit from layer 1 to layer 6
+                 AliITStrackMI otrack2(ot);
+                 otrack2.ResetCovariance(10.); 
+                 otrack2.ResetClusters();
+                 //fit from layer 6 to layer 1
+                 if(RefitAt(AliITSRecoParam::GetrInsideSPD1(),&otrack2,&ot)) {
+                   new(arrMI[nFoundTracks]) AliITStrackMI(otrack2);
+                   new(arrSA[nFoundTracks]) AliITStrackSA(trac);
+                   ++nFoundTracks;
+                 }
+                              
+               }       
+             }
+            }//end loop layer 6
+          }//end loop layer 5
+        }//end loop layer 4        
+      }//end loop layer 3
+    }//end loop layer 2 
+  }//end loop layer 1
 
-}
 
-//________________________________________________________________
-void AliITStrackerSA::UpdatePoints(){
-  //update of points for the estimation of the curvature  
 
-  fPoint1[0]=fPoint2[0]; 
-  fPoint1[1]=fPoint2[1];
-  fPoint2[0]=fPoint3[0];
-  fPoint2[1]=fPoint3[1];
-  fPoint3[0]=fPointc[0];
-  fPoint3[1]=fPointc[1];
 
-  
-}
+  if(fListOfTracks->GetEntries()==0) return 0;
 
-//_________________________________________________________________
+  Int_t lowchi2 = FindTrackLowChiSquare();
+  AliITStrackV2* otrack =(AliITStrackV2*)fListOfTracks->At(lowchi2);
+  AliITStrackSA* trsa = (AliITStrackSA*)fListOfSATracks->At(lowchi2);
+  if(otrack==0) return 0;
 
-Int_t AliITStrackerSA::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackSA* trs,Double_t zvertex,Double_t yvertex,Double_t xvertex,Int_t pflag,AliITSclusterTable* table){
-  //function used to to find the clusters associated to the track
-  Int_t nc=0;
-  AliITSlayer &lay = fgLayers[layer];
-  Int_t firstmod[fGeom->GetNlayers()];
-  for(Int_t i=0;i<fGeom->GetNlayers();i++){
-    firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
-  }
-  if(pflag==1){
-      
-    Float_t cx1,cx2,cy1,cy2;
-    FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
-    Int_t fun = FindIntersection(fCoef1,fCoef2,fCoef3,-(lay.GetR()*lay.GetR()),cx1,cy1,cx2,cy2);
-    if(fun==0) return 0;
-    Double_t fi1 =TMath::ATan2(cy1,cx1);
-    Double_t fi2 =TMath::ATan2(cy2,cx2);
-    fPhiEstimate = ChoosePoint(fi1,fi2,fPhic);
+  CookLabel(otrack,0.); //MI change - to see fake ratio
+  Int_t label=FindLabel(otrack);
+  otrack->SetLabel(label);  
+  Double_t low=0.;
+  Double_t up=0.51;    
+  otrack->CookdEdx(low,up);
+
+  //remove clusters of found track
+  for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
+    for(Int_t cln=0;cln<trsa->GetNumberOfMarked(nlay);cln++){
+      Int_t index = trsa->GetClusterMark(nlay,cln);
+      RemoveClusterCoord(nlay,index);
+    }    
   }
 
-  Double_t zed = TMath::Tan(fLambdac)*lay.GetR()+zvertex;
-  Double_t zed1  =  TMath::Tan(fLambdac+lambdawindow)*lay.GetR()+zvertex;
-  Double_t zed2  =  TMath::Tan(fLambdac-lambdawindow)*lay.GetR()+zvertex;
-  
-  Double_t fi = fPhiEstimate;
-  Int_t nmod  = lay.FindDetectorIndex(fi,zed)+firstmod[layer];
-  Int_t nm[8]={0,0,0,0,0,0,0,0};
-  nm[0] = lay.FindDetectorIndex(fi+phiwindow,zed)+firstmod[layer];
-  nm[1] = lay.FindDetectorIndex(fi-phiwindow,zed)+firstmod[layer];
-  nm[2]  = lay.FindDetectorIndex(fi,zed1)+firstmod[layer];
-  nm[3]  = lay.FindDetectorIndex(fi,zed2)+firstmod[layer];
-  nm[4]  = lay.FindDetectorIndex(fi+phiwindow,zed1)+firstmod[layer];
-  nm[5]  = lay.FindDetectorIndex(fi-phiwindow,zed1)+firstmod[layer];
-  nm[6]  = lay.FindDetectorIndex(fi+phiwindow,zed2)+firstmod[layer];
-  nm[7]  = lay.FindDetectorIndex(fi-phiwindow,zed2)+firstmod[layer];
+  return otrack;
 
-   if(nmod<0) return 0;
-  Int_t nn=0;
-  TArrayI* array =(TArrayI*)table->GetListOfClusters(nmod);
-  TArrayI* list = new TArrayI(array->GetSize());
-  for(Int_t i=0;i<array->GetSize();i++){
-    Int_t in=(Int_t)array->At(i);
-    list->AddAt(in,nn);
-    nn++;
+}
+
+//_______________________________________________________
+void AliITStrackerSA::StoreTrack(AliITStrackV2 *t,AliESDEvent *event, Bool_t pureSA) const 
+{
+  //
+  // Add new track to the ESD
+  //
+  AliESDtrack outtrack;
+  outtrack.UpdateTrackParams(t,AliESDtrack::kITSin);
+  if(pureSA) outtrack.SetStatus(AliESDtrack::kITSpureSA);
+  for(Int_t i=0;i<12;i++) {
+    outtrack.SetITSModuleIndex(i,t->GetModuleIndex(i));
   }
-  
-  for(Int_t ii=0;ii<8;ii++){
-    if(nm[ii]!=nmod && nm[ii]>=0){
-      TArrayI* ar =(TArrayI*)table->GetListOfClusters(nm[ii]);
-      list->Set(list->GetSize()+ar->GetSize());
-      for(Int_t j=0;j<ar->GetSize();j++){
-       Int_t in=(Int_t)ar->At(j);
-       list->AddAt(in,nn);
-       nn++;
+  Double_t sdedx[4]={0.,0.,0.,0.};
+  for(Int_t i=0; i<4; i++) sdedx[i]=t->GetSampledEdx(i);
+  outtrack.SetITSdEdxSamples(sdedx);
+
+
+  if(AliITSReconstructor::GetRecoParam()->GetSAUsedEdxInfo()){
+    Double_t mom=t->P();
+    Double_t ppid[AliPID::kSPECIES];
+    for(Int_t isp=0;isp<AliPID::kSPECIES;isp++) ppid[isp]=0.;
+    ppid[AliPID::kPion]=1.;
+    if(mom<0.7){
+      Double_t truncmean=t->GetdEdx();
+      Int_t ide=fITSPid->GetParticleIdFromdEdxVsP(mom,truncmean,kTRUE);
+      if(ide==AliPID::kProton){
+       ppid[AliPID::kProton]=1.;
+       ppid[AliPID::kPion]=0.;
       }
-    }
-  }
-  for(Int_t i=0;i<list->GetSize();i++){
-    Int_t index = (Int_t)list->At(i);
-    AliITSclusterV2* cllay = lay.GetCluster(index);
-    if(cllay==0) continue;
-    if(cllay->IsUsed()==1) continue;
-    
-    Double_t x,y,z;
-    Int_t modlay = cllay->GetDetectorIndex()+firstmod[layer];
-    GetClusterGCoordinates(cllay,modlay,x,y,z);
-    Double_t phi   = TMath::ATan2(y,x);
-    Double_t lambda=TMath::ATan2(z-zvertex,TMath::Sqrt((x-xvertex)*(x-xvertex)+(y-yvertex)*(y-yvertex)));
-
-
-    if(TMath::Abs(fLambdac-lambda)<lambdawindow && 
-       TMath::Abs(fPhiEstimate-phi)<phiwindow){
-      nc+=1;
-      fLambdac = lambda;
-      if(trs->GetNumberOfClustersSA()==20){
-       delete list;
-       return 0;
+      else if(ide==AliPID::kKaon){ 
+       ppid[AliPID::kKaon]=1.; 
+       ppid[AliPID::kPion]=0.;
       }
-      trs->AddClusterSA(layer,index);
-      cllay->Use();
-      fPhiEstimate=phi;
-      fPointc[0]=x;fPointc[1]=y;
     }
-
+    outtrack.SetITSpid(ppid);
+    outtrack.SetESDpid(ppid);    
   }
-  delete list;
-  return nc;
+  event->AddTrack(&outtrack);
 
+  return;
 }
 
-//__________________________________________________________________
-void AliITStrackerSA::GetClusterGCoordinates(AliITSclusterV2* cluster,Int_t module,Double_t& x, Double_t& y, Double_t& z){
 
-  //returns x,y,z of cluster in global coordinates
+//_______________________________________________________
+Int_t AliITStrackerSA::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackSA* trs,Double_t /*zvertex*/,Int_t pflag){
+  //function used to to find the clusters associated to the track
 
-  Double_t rot[9];     fGeom->GetRotMatrix(module,rot);
-  Int_t lay,lad,det; fGeom->GetModuleId(module,lay,lad,det);
-  Float_t tx,ty,tz;  fGeom->GetTrans(lay,lad,det,tx,ty,tz);     
+  if(ForceSkippingOfLayer(layer)) return 0;
 
-  Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
-  Double_t phi=TMath::Pi()/2+alpha;
-  if (lay==1) phi+=TMath::Pi();
 
-  Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
-  Double_t r=tx*cp+ty*sp;
+  Int_t nc=0;
+  AliITSlayer &lay = fgLayers[layer];
+  Double_t r=lay.GetR();
+  if(pflag==1){      
+    Double_t cx1,cx2,cy1,cy2;
+    FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
+    if (FindIntersection(fCoef1,fCoef2,fCoef3,-r*r,cx1,cy1,cx2,cy2)==0)
+       return 0;
+    Double_t fi1=TMath::ATan2(cy1-fPoint1[1],cx1-fPoint1[0]);
+    Double_t fi2=TMath::ATan2(cy2-fPoint1[1],cx2-fPoint1[0]);
+    fPhiEstimate=ChoosePoint(fi1,fi2,fPhic);
+  }
 
-  x= r*cp - cluster->GetY()*sp;
-  y= r*sp + cluster->GetY()*cp;
-  z=cluster->GetZ();
+  Double_t phiExpect=fPhiEstimate;
+  Double_t lamExpect=fLambdac;
 
-  
+  Int_t ncl = fCluCoord[layer]->GetEntriesFast();
+  Int_t startcl=FindIndex(layer,lamExpect-lambdawindow*1.02);
+  Int_t endcl=FindIndex(layer,lamExpect+lambdawindow*1.02)+1;
+  if(endcl>=ncl) endcl=ncl-1;
 
+  for (Int_t index=startcl; index<=endcl; index++) {
+    //for (Int_t index=0; index<ncl; index++) {
+    AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(layer,index);
+
+
+    Double_t phi = arr->GetPhi();
+    Double_t deltaPhi = phi-phiExpect;
+    if(deltaPhi>TMath::Pi()) deltaPhi-=2*TMath::Pi();
+    else if(deltaPhi<-TMath::Pi()) deltaPhi+=2*TMath::Pi();
+    if (TMath::Abs(deltaPhi)>phiwindow) continue;
+    
+    Double_t lambda = arr->GetLambda();
+    if (TMath::Abs(lambda-lamExpect)>lambdawindow) continue;
+
+    if(trs->GetNumberOfClustersSA()==trs->GetMaxNumberOfClusters()) return 0;
+    if(trs->GetNumberOfMarked(layer)==trs->GetMaxNMarkedPerLayer()) return 0;
+    Int_t orind = arr->GetOrInd();
+    trs->AddClusterSA(layer,orind);
+    trs->AddClusterMark(layer,index);
+    nc++;
+    fLambdac=lambda;
+    fPhiEstimate=phi;
+    
+    fPointc[0]=arr->GetX();
+    fPointc[1]=arr->GetY();
+    
+  }
+  return nc;
 }
-//__________________________________________________________________
-void AliITStrackerSA::GetClusterGErrors(AliITSclusterV2* cluster,Int_t module,Double_t& sigmax, Double_t& sigmay, Double_t& sigmaz){
 
-  //returns x,y,z of cluster in global coordinates
+//________________________________________________________________
+Bool_t AliITStrackerSA::SetFirstPoint(Int_t lay, Int_t clu, Double_t* primaryVertex){
+  // Sets the first point (seed) for tracking
+
+  AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(lay,clu);
+  fPhic = arr->GetPhi();
+  fLambdac = arr->GetLambda();
+  fPhiEstimate = fPhic;
+  fPoint1[0]=primaryVertex[0];
+  fPoint1[1]=primaryVertex[1];
+  fPoint2[0]=arr->GetX();
+  fPoint2[1]=arr->GetY();
+  return kTRUE; 
+}
 
-  Double_t rot[9];     fGeom->GetRotMatrix(module,rot);
-  Int_t lay,lad,det; fGeom->GetModuleId(module,lay,lad,det);
-  Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
-  Double_t phi=TMath::Pi()/2+alpha;
-  if (lay==1) phi+=TMath::Pi();
+//________________________________________________________________
+void AliITStrackerSA::UpdatePoints(){
+  //update of points for the estimation of the curvature  
 
-  Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
+  fPoint2[0]=fPoint3[0];
+  fPoint2[1]=fPoint3[1];
+  fPoint3[0]=fPointc[0];
+  fPoint3[1]=fPointc[1];
 
-  sigmax = TMath::Sqrt(sp*sp*cluster->GetSigmaY2());
-  sigmay = TMath::Sqrt(cp*cp*cluster->GetSigmaY2());
-  sigmaz = TMath::Sqrt(cluster->GetSigmaZ2());
+  
 }
 
 //___________________________________________________________________
-Int_t AliITStrackerSA::FindEquation(Float_t x1, Float_t y1, Float_t x2, Float_t y2, Float_t x3, Float_t y3,Float_t& a, Float_t& b, Float_t& c){
+Int_t AliITStrackerSA::FindEquation(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t x3, Double_t y3,Double_t& a, Double_t& b, Double_t& c){
 
    //given (x,y) of three recpoints (in global coordinates) 
    //returns the parameters a,b,c of circonference x*x + y*y +a*x + b*y +c
-
-   Float_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
+   double dx31=x3-x1,dy31=y3-y1,dx21=x2-x1,dy21=y2-y1;
+   Double_t den = dx31*dy21-dx21*dy31;
    if(den==0) return 0;
-   a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
-   b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
+   else den = 1./den;
+   //
+   double r31 = -dx31*(x1+x3) - dy31*(y1+y3);
+   double r21 = -dx21*(x1+x2) - dy21*(y1+y2);
+   //
+   double da = r31*dy21 - r21*dy31;
+   double db = r21*dx31 - r31*dx21;
+   a = da*den;
+   b = db*den;
    c = -x1*x1-y1*y1-a*x1-b*y1;
    return 1;
  }
 //__________________________________________________________________________
- Int_t AliITStrackerSA::FindIntersection(Float_t a1, Float_t b1, Float_t c1, Float_t c2,Float_t& x1,Float_t& y1, Float_t& x2, Float_t& y2){
+ Int_t AliITStrackerSA::FindIntersection(Double_t a1, Double_t b1, Double_t c1, Double_t c2,Double_t& x1,Double_t& y1, Double_t& x2, Double_t& y2){
  
  //Finds the intersection between the circonference of the track and the circonference centered in (0,0) represented by one layer
  //c2 is -rlayer*rlayer
 
   if(a1==0) return 0;
- Float_t m = c2-c1; 
- Float_t aA = (b1*b1)/(a1*a1)+1;
- Float_t bB = (-2*m*b1/(a1*a1));
- Float_t cC = c2+(m*m)/(a1*a1);
- if((bB*bB-4*aA*cC)<0) return 0;
+ Double_t m = c2-c1; 
+ Double_t aA = (b1*b1)/(a1*a1)+1;
+ Double_t bB = (-2*m*b1/(a1*a1));
+ Double_t cC = c2+(m*m)/(a1*a1);
+ Double_t dD = bB*bB-4*aA*cC;
+ if(dD<0) return 0;
  
- y1 = (-bB+TMath::Sqrt(bB*bB-4*aA*cC))/(2*aA); 
- y2 = (-bB-TMath::Sqrt(bB*bB-4*aA*cC))/(2*aA); 
+ y1 = (-bB+TMath::Sqrt(dD))/(2*aA); 
+ y2 = (-bB-TMath::Sqrt(dD))/(2*aA); 
  x1 = (c2-c1-b1*y1)/a1;
  x2 = (c2-c1-b1*y2)/a1;
 
@@ -876,6 +836,8 @@ x2,Double_t y2,Double_t x3,Double_t y3){
   return 1/rad;
  
 }
+
+
 //____________________________________________________________________
 Double_t AliITStrackerSA::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
 
@@ -892,111 +854,99 @@ Double_t AliITStrackerSA::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
 
 
 //_________________________________________________________________
-AliITStrackV2* AliITStrackerSA::FindTrackLowChiSquare(TObjArray* tracklist, Int_t dim) const {
-  // returns track with lowes chi square  
-  if(dim==1){
-    AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(0);
-    return trk;
-  }
-  if(dim==0) return 0;
-  Double_t chi2[dim];
-  Int_t index[dim];
-  for(Int_t i=0;i<dim;i++){
-    AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(i);
-    chi2[i]=trk->GetChi2();
-    index[i]=i;
-  }
-
-  Int_t w=0;Double_t value;
-  Int_t lp;
-  while(w<dim){
-    for(Int_t j=w+1;j<dim;j++){
-      if(chi2[w]<chi2[j]){
-       value=chi2[w];
-       chi2[w]=chi2[j];
-       chi2[j]=value;
-       lp=index[w];
-       index[w]=index[j];
-       index[j]=lp;
-      }
+Int_t AliITStrackerSA::FindTrackLowChiSquare() const {
+  // returns track with lowest chi square  
+  Int_t dim=fListOfTracks->GetEntries();
+  if(dim<=1) return 0;
+  AliITStrackV2* trk = (AliITStrackV2*)fListOfTracks->At(0);
+  Double_t minChi2=trk->GetChi2();
+  Int_t index=0;
+  for(Int_t i=1;i<dim;i++){
+    trk = (AliITStrackV2*)fListOfTracks->At(i);
+    Double_t chi2=trk->GetChi2();
+    if(chi2<minChi2){
+      minChi2=chi2;
+      index=i;
     }
-    w++;
   }
-
-  AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(index[dim-1]);
-  return trk;
-  
+  return index;
 }
 
 //__________________________________________________________
-Int_t AliITStrackerSA::FindLabel(Int_t l1, Int_t l2, Int_t l3, Int_t l4, Int_t l5, Int_t l6){
-
-  //function used to determine the track label
-  
-  Int_t lb[6] = {l1,l2,l3,l4,l5,l6};
-  Int_t aa[6]={1,1,1,1,1,1};
-  Int_t ff=0; 
-  Int_t ll=0;
-  Int_t k=0;Int_t w=0;Int_t num=6;
-  if(lb[5]==-1) num=5;
+Int_t AliITStrackerSA::FindLabel(AliITStrackV2* track){
+  // compute the track label starting from cluster labels
   
-  while(k<num){
-  
-    for(Int_t i=k+1;i<num;i++){
-    
-      if(lb[k]==lb[i] && aa[k]!=0){
-      
-        aa[k]+=1;
-        aa[i]=0;
-      }
+  Int_t labl[AliITSgeomTGeo::kNLayers][3];
+  Int_t cnts[AliITSgeomTGeo::kNLayers][3];
+  for(Int_t j=0;j<AliITSgeomTGeo::GetNLayers();j++){
+    for(Int_t k=0;k<3;k++){
+      labl[j][k]=-2;
+      cnts[j][k]=1;
     }
-  k++;
   }
-
-  while(w<num){
-  
-    for(Int_t j=0;j<6;j++){
-      if(aa[w]<aa[j]){
-      ff=aa[w];
-      aa[w]=aa[j];
-      aa[j]=ff;
-      ll=lb[w];
-      lb[w]=lb[j];
-      lb[j]=ll;
-     }
+  Int_t iNotLabel=0;
+  for(Int_t i=0;i<track->GetNumberOfClusters(); i++) {
+    Int_t indexc = track->GetClusterIndex(i);
+    AliITSRecPoint* cl = (AliITSRecPoint*)GetCluster(indexc);
+    Int_t iLayer=cl->GetLayer();
+    for(Int_t k=0;k<3;k++){
+      labl[iLayer][k]=cl->GetLabel(k);
+      if(labl[iLayer][k]<0) iNotLabel++;
+    }
+  }
+  if(iNotLabel==3*track->GetNumberOfClusters()) return -2;
+
+  for(Int_t j1=0;j1<AliITSgeomTGeo::kNLayers; j1++) {
+    for(Int_t j2=0; j2<j1;  j2++){
+      for(Int_t k1=0; k1<3; k1++){
+       for(Int_t k2=0; k2<3; k2++){
+         if(labl[j1][k1]>=0 && labl[j1][k1]==labl[j2][k2] && cnts[j2][k2]>0){
+           cnts[j2][k2]++;
+           cnts[j1][k1]=0;
+         }
+       }
+      }
     }
-  w++;
   }
-  if(num==6)  return lb[5];
-  else return lb[4];
-}
-
-//_____________________________________________________________________________
-Int_t AliITStrackerSA::Label(Int_t gl1, Int_t gl2, Int_t gl3, Int_t gl4, Int_t gl5, Int_t gl6,Int_t gl7, Int_t gl8, Int_t gl9, Int_t gl10,Int_t gl11,
-Int_t gl12, Int_t gl13, Int_t gl14,Int_t gl15, Int_t gl16, Int_t gl17, Int_t gl18, Int_t numberofpoints){
-
-  //function used to assign label to the found track. If track is fake, the label is negative
 
-  Int_t lb0[6] = {gl1,gl2,gl3,gl4,gl5,gl6};
-  Int_t lb1[6] = {gl7,gl8,gl9,gl10,gl11,gl12};
-  Int_t lb2[6] = {gl13,gl14,gl15,gl16,gl17,gl18};
-  Int_t ll=FindLabel(lb0[0],lb0[1],lb0[2],lb0[3],lb0[4],lb0[5]);
-  Int_t lflag=0;Int_t num=6;
-  if(lb0[5]==-1 && lb1[5]==-1 && lb2[5]==-1) num=5;
 
-  for(Int_t i=0;i<num;i++){
-    if(lb0[i]==ll || lb1[i]==ll || lb2[i]==ll) lflag+=1;
+  Int_t cntMax=0;
+  Int_t label=-1;
+  for(Int_t j=0;j<AliITSgeomTGeo::kNLayers;j++){
+    for(Int_t k=0;k<3;k++){
+      if(cnts[j][k]>cntMax && labl[j][k]>=0){
+       cntMax=cnts[j][k];
+       label=labl[j][k];
+      }
+    }
   }
 
-  if(lflag>=numberofpoints) return ll;
-  else return -ll;
-
+  Int_t lflag=0;
+  for(Int_t i=0;i<AliITSgeomTGeo::kNLayers;i++)
+    if(labl[i][0]==label || labl[i][1]==label || labl[i][2]==label) lflag++;
   
+  if(lflag<track->GetNumberOfClusters()) label = -label;
+  return label;
 }
-
 //_____________________________________________________________________________
-void AliITStrackerSA::SetWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
+void AliITStrackerSA::SetCalculatedWindowSizes(Int_t n, Double_t phimin, Double_t phimax, Double_t lambdamin, Double_t lambdamax){
+  // Set sizes of the phi and lambda windows used for track finding
+  fNloop = n;
+  if(fPhiWin) delete [] fPhiWin;
+  if(fLambdaWin) delete [] fLambdaWin;
+  fPhiWin = new Double_t[fNloop];
+  fLambdaWin = new Double_t[fNloop];
+  Double_t stepPhi=(phimax-phimin)/(Double_t)(fNloop-1);
+  Double_t stepLambda=(lambdamax-lambdamin)/(Double_t)(fNloop-1);
+  for(Int_t k=0;k<fNloop;k++){
+    Double_t phi=phimin+k*stepPhi;
+    Double_t lam=lambdamin+k*stepLambda;
+    fPhiWin[k]=phi;
+    fLambdaWin[k]=lam;
+  }
+}
+//_____________________________________________________________________________
+void AliITStrackerSA::SetFixedWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
   // Set sizes of the phi and lambda windows used for track finding
   fNloop = n;
   if(phi){ // user defined values
@@ -1008,60 +958,116 @@ void AliITStrackerSA::SetWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
     }
   }
   else {  // default values
-    Double_t phid[46]   = {0.001,0.0015,0.002,0.0023,0.0025,0.0027,0.003,
-                       0.0033,0.0035,0.0037,0.004,0.0043,0.0045,0.0047,
-                        0.005,0.0053,0.0055,
-                       0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
-                       0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
-                       0.01,0.0105,0.011,0.0115,0.012,0.0125,0.013,0.0135,
-                       0.014,0.0145,0.015,0.0155,0.016,0.0165,0.017};
-    Double_t lambdad[46] = {0.001,0.0015,0.002,0.0023,0.0025,0.0027,0.003,
-                       0.0033,0.0035,0.0037,0.004,0.0043,0.0045,0.0047,
-                        0.005,0.0053,0.0055,
-                       0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
-                       0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
-                       0.01,0.015,0.011,0.0115,0.012,0.0125,0.013,0.0135,
-                       0.014,0.0145,0.015,0.0155,0.016,0.016,0.016};
-    if(fNloop!=46){
-      fNloop = 46;
-      Warning("SetWindowSizes","Number of loop forced to the default value %d",fNloop);
+            
+    Double_t phid[32]   = {0.002,0.003,0.004,0.0045,0.0047,
+                          0.005,0.0053,0.0055,0.006,0.0063,
+                          0.0065,0.007,0.0073,0.0075,0.0077,
+                          0.008,0.0083,0.0085,0.0087,0.009,
+                          0.0095,0.0097,0.01,0.0105,0.011,
+                          0.0115,0.012,0.0125,0.013,0.0135,
+                          0.0140,0.0145};
+    Double_t lambdad[32] = {0.003,0.004,0.005,0.005,0.005,
+                           0.005,0.005,0.006,0.006,0.006,
+                           0.006,0.007,0.007,0.007,0.007,
+                           0.007,0.007,0.007,0.007,0.007,
+                           0.007,0.007,0.008,0.008,0.008,
+                           0.008,0.008,0.008,0.008,0.008,
+                           0.008,0.008};
+    
+    if(fNloop!=32){
+      fNloop = 32;
     }
-   
+    
+    
     fPhiWin = new Double_t[fNloop];
     fLambdaWin = new Double_t[fNloop];
-   
+
+    Double_t factor=AliITSReconstructor::GetRecoParam()->GetFactorSAWindowSizes(); // possibility to enlarge windows for cosmics reco with large misalignments (A.Dainese)
+  
     for(Int_t k=0;k<fNloop;k++){
-      fPhiWin[k]=phid[k];
-      fLambdaWin[k]=lambdad[k];
+      fPhiWin[k]=phid[k]*factor;
+      fLambdaWin[k]=lambdad[k]*factor;
     }
   
   }
 
 }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+//_______________________________________________________________________
+void AliITStrackerSA::GetCoorAngles(AliITSRecPoint* cl,Double_t &phi,Double_t &lambda, Double_t &x, Double_t &y,Double_t &z, const Double_t* vertex){
+  //Returns values of phi (azimuthal) and lambda angles for a given cluster
+/*  
+  Double_t rot[9];     fGeom->GetRotMatrix(module,rot);
+  Int_t lay,lad,det; fGeom->GetModuleId(module,lay,lad,det);
+  Double_t tx,ty,tz;  fGeom->GetTrans(lay,lad,det,tx,ty,tz);     
 
+  Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
+  Double_t phi1=TMath::Pi()/2+alpha;
+  if (lay==1) phi1+=TMath::Pi();
 
+  Double_t cp=TMath::Cos(phi1), sp=TMath::Sin(phi1);
+  Double_t r=tx*cp+ty*sp;
 
+  xyz= r*cp - cl->GetY()*sp;
+  y= r*sp + cl->GetY()*cp;
+  z=cl->GetZ();
+*/
+  Float_t xyz[3];
+  cl->GetGlobalXYZ(xyz);
+  x=xyz[0];
+  y=xyz[1];
+  z=xyz[2];
+  phi=TMath::ATan2(y-vertex[1],x-vertex[0]);
+  lambda=TMath::ATan2(z-vertex[2],TMath::Sqrt((x-vertex[0])*(x-vertex[0])+(y-vertex[1])*(y-vertex[1])));
+}
 
+//________________________________________________________________________
+void AliITStrackerSA::GetCoorErrors(AliITSRecPoint* cl,Double_t &sx,Double_t &sy, Double_t &sz){
 
+  //returns sigmax, y, z of cluster in global coordinates
+/*
+  Double_t rot[9];     fGeom->GetRotMatrix(module,rot);
+  Int_t lay,lad,det; 
+  AliITSgeomTGeo::GetModuleId(module,lay,lad,det);
+  Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
+  Double_t phi=TMath::Pi()/2+alpha;
+  if (lay==1) phi+=TMath::Pi();
 
+  Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
+*/
+  Float_t covm[6];
+  cl->GetGlobalCov(covm);
+  sx=TMath::Sqrt(covm[0]);
+  sy=TMath::Sqrt(covm[3]);
+  sz=TMath::Sqrt(covm[5]);
+/*
+  sx = TMath::Sqrt(sp*sp*cl->GetSigmaY2());
+  sy = TMath::Sqrt(cp*cp*cl->GetSigmaY2());
+  sz = TMath::Sqrt(cl->GetSigmaZ2());
+*/
+}
 
+//________________________________________________________________________
+Int_t AliITStrackerSA::FindIndex(Int_t lay, Double_t lamVal) const {
+  // Find the cluster at limit of lambda window 
+
+  Int_t base = 0;
+  Int_t last = fCluCoord[lay]->GetEntriesFast()-1;
+  if(last<0) return 0;
+  Int_t position;
+  Double_t lamfirst=((AliITSclusterTable*)fCluCoord[lay]->At(base))->GetLambda();
+  if(lamfirst>lamVal) return base;
+  Double_t lamlast=((AliITSclusterTable*)fCluCoord[lay]->At(last))->GetLambda();
+  if(lamlast<=lamVal) return last;
+  while (last >= base) {
+    position = (base+last) / 2;
+    Double_t a=((AliITSclusterTable*)fCluCoord[lay]->At(position))->GetLambda()-lamVal;
+    Double_t b=((AliITSclusterTable*)fCluCoord[lay]->At(position+1))->GetLambda()-lamVal;
+    if(a*b<=0) return position;
+    if(a>0) last = position;
+    else  base = position;
+  }
+  return 0;
+}