ATO-98 - connect distortion trees - with custom description ()
[u/mrichter/AliRoot.git] / TPC / AliTPCComparison.C
1 /// \file AliTPCComparison.C
2 /// \brief Very important, delicate and rather obscure macro
3 ///
4 /// Creates list of "trackable" tracks, calculates efficiency, resolutions etc.
5 ///
6 /// There is a possibility to run this macro over several events.
7 ///
8 /// \author I.Belikov, CERN, Jouri.Belikov@cern.ch, M.Ivanov, GSI, m.ivanov@gsi.de
9
10 #if !defined(__CINT__) || defined(__MAKECINT__)
11   #include <TMath.h>
12   #include <TError.h>
13   #include <Riostream.h>
14   #include <TH1F.h>
15   #include <TH2F.h>
16   #include <TTree.h>
17   #include <TParticle.h>
18   #include <TCanvas.h>
19   #include <TLine.h>
20   #include <TText.h>
21   #include <TBenchmark.h>
22   #include <TStyle.h>
23   #include <TFile.h>
24   #include <TROOT.h>
25
26   #include "AliStack.h"
27   #include "AliHeader.h"
28   #include "AliTrackReference.h"
29   #include "AliRunLoader.h"
30   #include "AliRun.h"
31   #include "AliESDEvent.h"
32   #include "AliESDtrack.h"
33
34   #include "AliSimDigits.h"
35   #include "AliTPC.h"
36   #include "AliTPCParamSR.h"
37   #include "AliTPCClustersArray.h"
38   #include "AliTPCClustersRow.h"
39   #include "AliTPCcluster.h"
40   #include "AliTPCLoader.h"
41
42   #include "AliCDBManager.h"
43   #include "AliTPCcalibDB.h"
44 #endif
45
46 Int_t GoodTracksTPC(const Char_t *dir=".");
47
48 extern TBenchmark *gBenchmark;
49 extern TROOT *gROOT;
50
51 static Int_t allgood=0;
52 static Int_t allselected=0;
53 static Int_t allfound=0;
54
55 Int_t AliTPCComparison
56 (Float_t ptcutl=0.2, Float_t ptcuth=10., const Char_t *dir=".") {
57    gBenchmark->Start("AliTPCComparison");
58
59    ::Info("AliTPCComparison.C","Doing comparison...");
60
61
62
63    TH1F *hp=(TH1F*)gROOT->FindObject("hp");
64    if (!hp) hp=new TH1F("hp","PHI resolution",50,-20.,20.); 
65    hp->SetFillColor(4);
66
67    TH1F *hl=(TH1F*)gROOT->FindObject("hl");
68    if (!hl) hl=new TH1F("hl","LAMBDA resolution",50,-20,20);
69    hl->SetFillColor(4);
70
71    TH1F *hpt=(TH1F*)gROOT->FindObject("hpt");
72    if (!hpt) hpt=new TH1F("hpt","Relative Pt resolution",30,-10.,10.); 
73    hpt->SetFillColor(2);
74  
75    TH1F *hmpt=(TH1F*)gROOT->FindObject("hmpt");
76    if (!hmpt) 
77       hmpt=new TH1F("hmpt","Relative Pt resolution (pt>4GeV/c)",30,-60,60); 
78    hmpt->SetFillColor(6);
79
80
81
82    TH1F *hgood=(TH1F*)gROOT->FindObject("hgood");
83    if (!hgood) hgood=new TH1F("hgood","Good tracks",30,0.2,6.1);
84     
85    TH1F *hfound=(TH1F*)gROOT->FindObject("hfound");
86    if (!hfound) hfound=new TH1F("hfound","Found tracks",30,0.2,6.1);
87
88    TH1F *hfake=(TH1F*)gROOT->FindObject("hfake");
89    if (!hfake) hfake=new TH1F("hfake","Fake tracks",30,0.2,6.1);
90
91    TH1F *hg=(TH1F*)gROOT->FindObject("hg");
92    if (!hg) hg=new TH1F("hg","Efficiency for good tracks",30,0.2,6.1);
93    hg->SetLineColor(4); hg->SetLineWidth(2);
94
95    TH1F *hf=(TH1F*)gROOT->FindObject("hf");
96    if (!hf) hf=new TH1F("hf","Efficiency for fake tracks",30,0.2,6.1);
97    hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
98
99    TH1F *he=(TH1F*)gROOT->FindObject("he");
100    if (!he) 
101       he =new TH1F("he","dE/dX for pions with 0.4<p<0.5 GeV/c",50,0.,100.);
102
103    TH2F *hep=(TH2F*)gROOT->FindObject("hep");
104    if (!hep) hep=new TH2F("hep","dE/dX vs momentum",50,0.,2.,50,0.,400.);
105    hep->SetMarkerStyle(8);
106    hep->SetMarkerSize(0.4);
107
108
109    Char_t fname[100];
110    sprintf(fname,"%s/GoodTracksTPC.root",dir);
111
112    TFile *refFile=TFile::Open(fname,"old");
113    if (!refFile || !refFile->IsOpen()) {
114      ::Info("AliTPCComparison.C","Marking good tracks (will take a while)...");
115      if (GoodTracksTPC(dir)) {
116         ::Error("AliTPCComparison.C","Can't generate the reference file !");
117         return 1;
118      }
119    }
120    refFile=TFile::Open(fname,"old");
121    if (!refFile || !refFile->IsOpen()) {
122      ::Error("AliTPCComparison.C","Can't open the reference file !");
123      return 2;
124    }   
125   
126    TTree *tpcTree=(TTree*)refFile->Get("tpcTree");
127    if (!tpcTree) {
128      ::Error("AliTPCComparison.C","Can't get the reference tree !");
129      return 3;
130    }
131    TBranch *branch=tpcTree->GetBranch("TPC");
132    if (!branch) {
133      ::Error("AliTPCComparison.C","Can't get the TPC branch !");
134      return 4;
135    }
136    TClonesArray dummy("AliTrackReference",1000), *refs=&dummy;
137    branch->SetAddress(&refs);
138
139
140    sprintf(fname,"%s/AliESDs.root",dir);
141    TFile *ef=TFile::Open(fname);
142    if ((!ef)||(!ef->IsOpen())) {
143       sprintf(fname,"%s/AliESDtpc.root",dir);
144       ef=TFile::Open(fname);
145       if ((!ef)||(!ef->IsOpen())) {
146          ::Error("AliTPCComparison.C","Can't open AliESDtpc.root !");
147          return 5;
148       }
149    }
150    AliESDEvent* event = new AliESDEvent();
151    TTree* esdTree = (TTree*) ef->Get("esdTree");
152    if (!esdTree) {
153       ::Error("AliTPCComparison.C", "no ESD tree found");
154       return 6;
155    }
156    event->ReadFromTree(esdTree);
157
158
159   // ******* Loop over events *********
160
161    Int_t e=0;
162    while (esdTree->GetEvent(e)) {
163       cout<<endl<<endl<<"********* Processing event number: "<<e<<"*******\n";
164
165       Int_t nentr=event->GetNumberOfTracks();
166       allfound+=nentr;
167
168       if (tpcTree->GetEvent(e++)==0) {
169          cerr<<"No reconstructable tracks !\n";
170          continue;
171       }
172
173       Int_t ngood=refs->GetEntriesFast(); 
174       allgood+=ngood;
175
176       const Int_t MAX=15000;
177     //MI change
178       Int_t track_notfound[MAX], itrack_notfound=0;
179       Int_t track_fake[MAX], itrack_fake=0;
180       Int_t track_multifound[MAX],track_multifound_n[MAX],itrack_multifound=0;
181
182       Int_t i;
183       for (Int_t k=0; k<ngood; k++) {
184         AliTrackReference *ref=(AliTrackReference*)refs->UncheckedAt(k); 
185         Int_t lab=ref->Label(), tlab=-1;
186         Float_t ptg=TMath::Sqrt(ref->Px()*ref->Px() + ref->Py()*ref->Py());
187
188         if (ptg<1e-33) continue; // for those not crossing 0 pad row
189   
190         if (ptg<ptcutl) continue;
191         if (ptg>ptcuth) continue;
192
193         allselected++;
194
195         hgood->Fill(ptg);
196
197         AliESDtrack *track=0;
198         for (i=0; i<nentr; i++) {
199           track=event->GetTrack(i);
200           tlab=track->GetTPCLabel();
201           if (lab==TMath::Abs(tlab)) break;
202         }
203         if (i==nentr) {
204            track_notfound[itrack_notfound++]=lab;
205            continue;
206         }
207       
208         //MI change  - addition
209         Int_t micount=0;
210         Int_t mi;
211         AliESDtrack * mitrack;
212         for (mi=0; mi<nentr; mi++) {
213           mitrack=event->GetTrack(mi);          
214           if (lab==TMath::Abs(mitrack->GetTPCLabel())) micount++;
215         }
216         if (micount>1) {
217           track_multifound[itrack_multifound]=lab;
218           track_multifound_n[itrack_multifound]=micount;
219           itrack_multifound++;
220         }
221         if ((track->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
222         if (lab==tlab) hfound->Fill(ptg);
223         else { 
224           track_fake[itrack_fake++]=lab;
225           hfake->Fill(ptg); 
226         }
227       
228         Double_t pxpypz[3]; track->GetInnerPxPyPz(pxpypz);
229         Float_t phi=TMath::ATan2(pxpypz[1],pxpypz[0]);
230         if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
231         if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
232         Double_t pt=TMath::Sqrt(pxpypz[0]*pxpypz[0]+pxpypz[1]*pxpypz[1]);
233         Float_t lam=TMath::ATan2(pxpypz[2],pt); 
234         Float_t pt_1=1/pt;
235
236         Int_t pdg=(Int_t)ref->GetLength();  //this is particle's PDG !
237
238         if (TMath::Abs(pdg)==11 && ptg>4.) {//high momentum electrons
239            hmpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
240         } else {
241            Float_t phig=TMath::ATan2(ref->Py(),ref->Px());
242            hp->Fill((phi - phig)*1000.);
243
244            Float_t lamg=TMath::ATan2(ref->Pz(),ptg);
245            hl->Fill((lam - lamg)*1000.);
246
247            hpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
248         }
249
250         Float_t mom=pt/TMath::Cos(lam);
251         Float_t dedx=track->GetTPCsignal();
252         hep->Fill(mom,dedx,1.);
253         if (TMath::Abs(pdg)==211) //pions
254            if (mom>0.4 && mom<0.5) {
255               he->Fill(dedx,1.);
256            }
257       }
258
259       cout<<"\nList of Not found tracks :\n";
260       for ( i = 0; i< itrack_notfound; i++){
261         cout<<track_notfound[i]<<"\t";
262         if ((i%5)==4) cout<<"\n";
263       }
264       cout<<"\nList of fake  tracks :\n";
265       for ( i = 0; i< itrack_fake; i++){
266         cout<<track_fake[i]<<"\t";
267         if ((i%5)==4) cout<<"\n";
268       }
269       cout<<"\nList of multiple found tracks :\n";
270       for ( i=0; i<itrack_multifound; i++) {
271           cout<<"id.   "<<track_multifound[i]
272               <<"     found - "<<track_multifound_n[i]<<"times\n";
273       }
274
275       cout<<"Number of found tracks ="<<nentr<<endl;
276       cout<<"Number of \"good\" tracks ="<<ngood<<endl;
277
278       refs->Clear();
279   }// ***** End of the loop over events
280
281    delete event;
282    delete esdTree;
283    ef->Close();
284
285    delete tpcTree;
286    refFile->Close();
287
288    Stat_t ng=hgood->GetEntries(), nf=hfound->GetEntries();
289    if (ng!=0) cout<<"\n\nIntegral efficiency is about "<<nf/ng*100.<<" %\n";
290    cout<<"Total number selected of \"good\" tracks ="<<allselected<<endl<<endl;
291    cout<<"Total number of found tracks ="<<allfound<<endl;
292    cout<<"Total number of \"good\" tracks ="<<allgood<<endl;
293    cout<<endl;
294
295    gStyle->SetOptStat(111110);
296    gStyle->SetOptFit(1);
297
298    TCanvas *c1=new TCanvas("c1","",0,0,700,850);
299
300    Int_t minc=33; 
301
302    TPad *p1=new TPad("p1","",0,0.3,.5,.6); p1->Draw();
303    p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10); 
304    hp->SetFillColor(4);  hp->SetXTitle("(mrad)"); 
305    if (hp->GetEntries()<minc) hp->Draw(); else hp->Fit("gaus"); c1->cd();
306
307    TPad *p2=new TPad("p2","",0.5,.3,1,.6); p2->Draw(); 
308    p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10);
309    hl->SetXTitle("(mrad)");
310    if (hl->GetEntries()<minc) hl->Draw(); else hl->Fit("gaus"); c1->cd();
311
312    TPad *p3=new TPad("p3","",0,0,0.5,0.3); p3->Draw();
313    p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10); 
314    hpt->SetXTitle("(%)");
315    if (hpt->GetEntries()<minc) hpt->Draw(); else hpt->Fit("gaus"); c1->cd();
316
317    TPad *p4=new TPad("p4","",0.5,0,1,0.3); p4->Draw();
318    p4->cd(); p4->SetFillColor(42); p4->SetFrameFillColor(10);
319    hmpt->SetXTitle("(%)");
320    if (hmpt->GetEntries()<minc) hmpt->Draw(); else hmpt->Fit("gaus"); c1->cd();
321
322    TPad *p5=new TPad("p5","",0,0.6,1,1); p5->Draw(); p5->cd(); 
323    p5->SetFillColor(41); p5->SetFrameFillColor(10);
324    hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
325    hg->Divide(hfound,hgood,1,1.,"b");
326    hf->Divide(hfake,hgood,1,1.,"b");
327    hg->SetMaximum(1.4);
328    hg->SetYTitle("Tracking efficiency");
329    hg->SetXTitle("Pt (GeV/c)");
330    hg->Draw();
331
332    TLine *line1 = new TLine(0.1,1.0,6.1,1.0); line1->SetLineStyle(4);
333    line1->Draw("same");
334    TLine *line2 = new TLine(0.1,0.9,6.1,0.9); line2->SetLineStyle(4);
335    line2->Draw("same");
336
337    hf->SetFillColor(1);
338    hf->SetFillStyle(3013);
339    hf->SetLineColor(2);
340    hf->SetLineWidth(2);
341    hf->Draw("histsame");
342    TText *text = new TText(0.461176,0.248448,"Fake tracks");
343    text->SetTextSize(0.05);
344    text->Draw();
345    text = new TText(0.453919,1.11408,"Good tracks");
346    text->SetTextSize(0.05);
347    text->Draw();
348
349
350
351    TCanvas *c2=new TCanvas("c2","",320,32,530,590);
352
353    TPad *p6=new TPad("p6","",0.,0.,1.,.5); p6->Draw();
354    p6->cd(); p6->SetFillColor(42); p6->SetFrameFillColor(10); 
355    he->SetFillColor(2); he->SetFillStyle(3005);  
356    he->SetXTitle("Arbitrary Units"); 
357    if (he->GetEntries()<minc) he->Draw(); else he->Fit("gaus"); c2->cd();
358
359    TPad *p7=new TPad("p7","",0.,0.5,1.,1.); p7->Draw(); 
360    p7->cd(); p7->SetFillColor(42); p7->SetFrameFillColor(10);
361    hep->SetXTitle("p (Gev/c)"); hep->SetYTitle("dE/dX (Arb. Units)"); 
362    hep->Draw(); c1->cd();
363
364    TFile fc("AliTPCComparison.root","RECREATE");
365    c1->Write();
366    c2->Write();
367    fc.Close();
368
369    gBenchmark->Stop("AliTPCComparison");
370    gBenchmark->Show("AliTPCComparison");
371
372    return 0;
373 }
374
375
376 Int_t GoodTracksTPC(const Char_t *dir) {
377    Char_t fname[100];
378    sprintf(fname,"%s/galice.root",dir);
379
380    AliRunLoader *rl = AliRunLoader::Open(fname,"COMPARISON");
381    if (!rl) {
382       ::Error("GoodTracksTPC","Can't start session !");
383       return 1;
384    }
385
386    rl->LoadgAlice();
387    rl->LoadHeader();
388    rl->LoadKinematics();
389    rl->LoadTrackRefs();
390
391    AliTPCLoader *tpcl = (AliTPCLoader *)rl->GetLoader("TPCLoader");
392    if (tpcl == 0x0) {
393       ::Error("GoodTracksTPC","Can not find TPCLoader !");
394       delete rl;
395       return 2;
396    }
397       
398    AliTPC *TPC=(AliTPC*)rl->GetAliRun()->GetDetector("TPC");
399    Int_t ver = TPC->IsVersion(); 
400    cout<<"TPC version "<<ver<<" has been found !\n";
401    if (ver==1) tpcl->LoadRecPoints();
402    else if (ver==2) tpcl->LoadDigits();
403    else {
404       ::Error("GoodTracksTPC","Wrong TPC version !");
405       delete rl;
406       return 3;
407    } 
408
409
410    AliCDBManager *man=AliCDBManager::Instance();
411    man->SetDefaultStorage("local://$ALICE_ROOT/OCDB");
412    man->SetRun(0);
413    AliTPCParamSR *digp=
414    (AliTPCParamSR*)(AliTPCcalibDB::Instance()->GetParameters());
415    if (!digp) { 
416      ::Error("AliTPCComparison.C","TPC parameters have not been found !");
417      delete rl;
418      return 4; 
419    }
420
421    Int_t nrow_up=digp->GetNRowUp();
422    Int_t nrows=digp->GetNRowLow()+nrow_up;
423    Int_t zero=digp->GetZeroSup();
424    Int_t gap=Int_t(0.125*nrows), shift=Int_t(0.5*gap);
425    Int_t good_number=Int_t(0.4*nrows);
426
427    Int_t nev=rl->GetNumberOfEvents();
428    ::Info("GoodTracksTPC","Number of events : %d\n",nev);  
429
430
431    sprintf(fname,"%s/GoodTracksTPC.root",dir);
432    TFile *file=TFile::Open(fname,"recreate");
433
434    TClonesArray dummy("AliTrackReference",1000), *refs=&dummy;
435    TTree tpcTree("tpcTree","Tree with info about the reconstructable TPC tracks");
436    tpcTree.Branch("TPC",&refs);
437
438    //********  Loop over generated events 
439    for (Int_t e=0; e<nev; e++) {
440      Int_t nt=0;
441      refs->Clear();
442
443      Int_t i;
444
445      rl->GetEvent(e);  file->cd();
446
447      Int_t np = rl->GetHeader()->GetNtrack();
448      cout<<"Event "<<e<<" Number of particles: "<<np<<endl;
449
450      //******** Fill the "good" masks
451      Int_t *good=new Int_t[np]; for (i=0; i<np; i++) good[i]=0;
452      switch (ver) {
453      case 1:
454         {
455         AliTPCClustersArray *pca=new AliTPCClustersArray, &ca=*pca;
456         ca.Setup(digp);
457         ca.SetClusterType("AliTPCcluster");
458         ca.ConnectTree(tpcl->TreeR());
459         Int_t nrows=Int_t(ca.GetTree()->GetEntries());
460         for (Int_t n=0; n<nrows; n++) {
461           AliSegmentID *s=ca.LoadEntry(n);
462           Int_t sec,row;
463           digp->AdjustSectorRow(s->GetID(),sec,row);
464           AliTPCClustersRow &clrow = *ca.GetRow(sec,row);
465           Int_t ncl=clrow.GetArray()->GetEntriesFast();
466           while (ncl--) {
467               AliTPCcluster *c=(AliTPCcluster*)clrow[ncl];
468               Int_t lab=c->GetLabel(0);
469               if (lab<0) continue; //noise cluster
470               lab=TMath::Abs(lab);
471
472               if (sec>=digp->GetNInnerSector())
473                  if (row==nrow_up-1) good[lab]|=0x4000;
474               if (sec>=digp->GetNInnerSector())
475                  if (row==nrow_up-1-gap) good[lab]|=0x1000;
476
477               if (sec>=digp->GetNInnerSector())
478                  if (row==nrow_up-1-shift) good[lab]|=0x2000;
479               if (sec>=digp->GetNInnerSector())
480                  if (row==nrow_up-1-gap-shift) good[lab]|=0x800;
481
482               good[lab]++;
483           }
484           ca.ClearRow(sec,row);
485         }
486         delete pca;
487         }
488         break;
489      case 2:
490         {
491         TTree *TD=tpcl->TreeD();
492       
493         AliSimDigits da, *digits=&da;
494         TD->GetBranch("Segment")->SetAddress(&digits);
495
496         Int_t *count = new Int_t[np];
497         Int_t i;
498         for (i=0; i<np; i++) count[i]=0;
499
500         Int_t sectors_by_rows=(Int_t)TD->GetEntries();
501         for (i=0; i<sectors_by_rows; i++) {
502           if (!TD->GetEvent(i)) continue;
503           Int_t sec,row;
504           digp->AdjustSectorRow(digits->GetID(),sec,row);
505           //cerr<<sec<<' '<<row<<'\r';
506           digits->First();
507           do { //Many thanks to J.Chudoba who noticed this
508               Int_t it=digits->CurrentRow(), ip=digits->CurrentColumn();
509               Short_t dig = digits->GetDigit(it,ip);
510               Int_t idx0=digits->GetTrackID(it,ip,0); 
511               Int_t idx1=digits->GetTrackID(it,ip,1);
512               Int_t idx2=digits->GetTrackID(it,ip,2);
513               if (idx0>=0 && dig>=zero && idx0<np) count[idx0]+=1;
514               if (idx1>=0 && dig>=zero && idx1<np) count[idx1]+=1;
515               if (idx2>=0 && dig>=zero && idx2<np) count[idx2]+=1;
516           } while (digits->Next());
517           for (Int_t j=0; j<np; j++) {
518               if (count[j]>1) {
519                  if (sec>=digp->GetNInnerSector())
520                    if (row==nrow_up-1    ) good[j]|=0x4000;
521                  if (sec>=digp->GetNInnerSector())
522                    if (row==nrow_up-1-gap) good[j]|=0x1000;
523
524                  if (sec>=digp->GetNInnerSector())
525                    if (row==nrow_up-1-shift) good[j]|=0x2000;
526                  if (sec>=digp->GetNInnerSector())
527                    if (row==nrow_up-1-gap-shift) good[j]|=0x800;
528                  good[j]++;
529               }
530               count[j]=0;
531           }
532         }
533         delete[] count;
534         }
535         break;
536      }
537
538
539      //****** select tracks which are "good" enough
540      AliStack* stack = rl->Stack();
541      for (i=0; i<np; i++) {
542         if ((good[i]&0x5000) != 0x5000)
543         if ((good[i]&0x2800) != 0x2800) continue;
544         if ((good[i]&0x7FF ) < good_number) continue;
545
546         TParticle *p = (TParticle*)stack->Particle(i);
547         if (p == 0x0) {
548          cerr<<"Can not get particle "<<i<<endl;
549          continue;
550         }
551         if (p->Pt()<0.100) continue;
552         if (TMath::Abs(p->Pz()/p->Pt())>0.999) continue;
553
554         Double_t vx=p->Vx(),vy=p->Vy(),vz=p->Vz();
555         if (TMath::Sqrt(vx*vx+vy*vy)>3.5) continue;
556         if (TMath::Abs(vz) > 50.) continue;
557
558         AliTrackReference *ref=new((*refs)[nt]) AliTrackReference();
559
560         ref->SetLabel(i);
561         Int_t pdg=p->GetPdgCode();
562         ref->SetLength(pdg);  //This will the particle's PDG !
563         ref->SetMomentum(0.,0.,0.);  
564         ref->SetPosition(0.,0.,0.);
565
566         nt++;
567      }
568
569      //**** check if there is also information at the entrance of the TPC
570      TTree *TR=rl->TreeTR();
571      TBranch *branch=TR->GetBranch("TrackReferences");
572      if (branch==0) {
573         ::Error("GoodTracksTPC","No track references !");
574         delete rl;
575         return 5;
576      }
577      TClonesArray tpcdummy("AliTrackReference",1000), *tpcRefs=&tpcdummy;
578      branch->SetAddress(&tpcRefs);
579      Int_t nr=(Int_t)TR->GetEntries();
580      for (Int_t r=0; r<nr; r++) {
581          //cerr<<r<<' '<<nr<<'\r';
582          TR->GetEvent(r);
583
584          Int_t nref = tpcRefs->GetEntriesFast();
585          if (!nref) continue;
586          AliTrackReference *tpcRef= 0x0;         
587          for (Int_t iref=0; iref<nref; ++iref) {
588            tpcRef = (AliTrackReference*)tpcRefs->UncheckedAt(iref);
589            if (tpcRef->DetectorId() == AliTrackReference::kTPC) break;
590            tpcRef = 0x0;
591          }
592
593          if (!tpcRef) continue;
594
595          Int_t j;
596          AliTrackReference *ref=0;
597          for (j=0; j<nt; j++) {
598            ref=(AliTrackReference *)refs->UncheckedAt(j);
599            if (ref->Label()==tpcRef->Label()) break;
600            ref=0;
601          }  
602          if (ref==0) continue;
603
604          ref->SetMomentum(tpcRef->Px(),tpcRef->Py(),tpcRef->Pz());
605          ref->SetPosition(tpcRef->LocalX(),tpcRef->LocalY(),tpcRef->Z());
606
607          tpcRefs->Clear();
608      }
609
610      tpcTree.Fill();
611
612      delete[] good;
613    } //****** end of the loop over generated events
614
615    
616    tpcTree.Write();
617    file->Close();
618
619    delete rl;
620    return 0;
621 }