ITS/TPCtracks.C

   1 #ifndef __CINT__
   2   #include "alles.h"
   3  #include "AliTPCtracker.h"
   4 #endif
   5
   6 struct GoodTrack {
   7   Int_t lab;
   8   Int_t code;
   9   Float_t px,py,pz;
  10   Float_t x,y,z;
  11   Float_t pxg,pyg,pzg,ptg;
  12   Bool_t flag;
  13 };
  14 Int_t good_tracks(GoodTrack *gt, Int_t max);
  15
  16 Int_t TPCtracks() {
  17   Int_t i;
  18    gBenchmark->Start("AliTPCComparison");
  19   //to run alone
  20  AliKalmanTrack::SetConvConst(100/0.299792458/0.2/gAlice->Field()->Factor());
  21
  22    TFile *cf=TFile::Open("AliTPCclusters.root");
  23    if (!cf->IsOpen()) {cerr<<"Can't open AliTPCclusters.root !\n"; return 1;}
  24    AliTPCParam *digp= (AliTPCParam*)cf->Get("75x40_100x60");
  25    if (!digp) { cerr<<"TPC parameters have not been found !\n"; return 2; }
  26    AliTPCtracker *tracker = new AliTPCtracker(digp);
  27 /*
  28 // Load clusters
  29    AliTPCClustersArray *ca=new AliTPCClustersArray;
  30    ca->Setup(digp);
  31    ca->SetClusterType("AliTPCcluster");
  32    ca->ConnectTree("Segment Tree");
  33    Int_t nentr=Int_t(ca->GetTree()->GetEntries());
  34    for (i=0; i<nentr; i++) ca->LoadEntry(i);
  35 */
  36 // Load clusters
  37    tracker->LoadInnerSectors();
  38    tracker->LoadOuterSectors();
  39
  40 // Load tracks
  41    TFile *tf=TFile::Open("AliTPCtracks.root");
  42    if (!tf->IsOpen()) {cerr<<"Can't open AliTPCtracks.root !\n"; return 3;}
  43    TObjArray tarray(2000);
  44   // TTree *tracktree=(TTree*)tf->Get("TreeT");
  45    TTree *tracktree=(TTree*)tf->Get("TPCf");
  46    if (!tracktree) {cerr<<"Can't get a tree with TPC tracks !\n"; return 4;}
  47    TBranch *tbranch=tracktree->GetBranch("tracks");
  48    Int_t nentr=(Int_t)tracktree->GetEntries();
  49
  50    AliTPCtrack *iotrack=0;
  51    for (i=0; i<nentr; i++) {
  52        iotrack=new AliTPCtrack;
  53        tbranch->SetAddress(&iotrack);
  54        tracktree->GetEvent(i);
  55        //iotrack->CookLabel(ca);
  56        tracker->CookLabel(iotrack,0.1);
  57        tarray.AddLast(iotrack);
  58    }
  59
  60    delete tracker;
  61
  62    tf->Close();
  63
  64    //delete ca;
  65    cf->Close();
  66
  67 /////////////////////////////////////////////////////////////////////////
  68    GoodTrack gt[15000];
  69    Int_t ngood=0;
  70    ifstream in("good_tracks_tpc");
  71    if (in) {
  72       cerr<<"Reading good tracks...\n";
  73       while (in>>gt[ngood].lab>>gt[ngood].code>>
  74                  gt[ngood].px>>gt[ngood].py>>gt[ngood].pz>>
  75                  gt[ngood].x >>gt[ngood].y >>gt[ngood].z>>
  76                  gt[ngood].pxg>>gt[ngood].pyg>>gt[ngood].pzg>>
  77                  gt[ngood].ptg>>gt[ngood].flag) {
  78          ngood++;
  79          cerr<<ngood<<'\r';
  80          if (ngood==15000) {
  81             cerr<<"Too many good tracks !\n";
  82             break;
  83          }
  84       }
  85       if (!in.eof()) cerr<<"Read error (good_tracks_tpc) !\n";
  86    } else {
  87       cerr<<"Marking good tracks (this will take a while)...\n";
  88       ngood=good_tracks(gt,15000);
  89       ofstream out("good_tracks_tpc");
  90       if (out) {
  91          for (Int_t ngd=0; ngd<ngood; ngd++)
  92             out<<gt[ngd].lab<<' '<<gt[ngd].code<<' '<<
  93                  gt[ngd].px<<' '<<gt[ngd].py<<' '<<gt[ngd].pz<<' '<<
  94                  gt[ngd].x <<' '<<gt[ngd].y <<' '<<gt[ngd].z<<' '<<
  95                   gt[ngd].pxg<<' '<<gt[ngd].pyg<<' '<<gt[ngd].pzg<<' '<<' '
  96                   <<gt[ngd].ptg<<gt[ngd].flag<<endl;
  97       } else cerr<<"Can not open file (good_tracks_tpc) !\n";
  98       out.close();
  99
 100       cerr<<"Preparing tracks for matching with the ITS...\n";
 101       tarray.Sort();
 102       tf=TFile::Open("AliTPCtracks.root","recreate");
 103      // tracktree=new TTree("TreeT","Tree with TPC tracks");
 104      tracktree=new TTree("TPCf","Tree with TPC tracks");
 105       tracktree->Branch("tracks","AliTPCtrack",&iotrack,32000,0);
 106       for (i=0; i<nentr; i++) {
 107           iotrack=(AliTPCtrack*)tarray.UncheckedAt(i);
 108           tracktree->Fill();
 109       }
 110       tracktree->Write();
 111       tf->Close();
 112
 113    }
 114    cerr<<"Number of good tracks : "<<ngood<<endl;
 115
 116    cerr<<"Doing comparison...\n";
 117    TH1F *hp=new TH1F("hp","PHI resolution",50,-20.,20.); hp->SetFillColor(4);
 118    TH1F *hl=new TH1F("hl","LAMBDA resolution",50,-20,20);hl->SetFillColor(4);
 119    TH1F *hpt=new TH1F("hpt","Relative Pt resolution",30,-10.,10.);
 120    hpt->SetFillColor(2);
 121    TH1F *hmpt=new TH1F("hmpt","Relative Pt resolution (pt>4GeV/c)",30,-60,60);
 122    hmpt->SetFillColor(6);
 123
 124    AliTPCtrack *trk=(AliTPCtrack*)tarray.UncheckedAt(0);
 125    Double_t pmin=0.1*(100/0.299792458/0.2/trk->GetConvConst());
 126    Double_t pmax=6.0+pmin;
 127    /*
 128    TH1F *hgood=new TH1F("hgood","Good tracks",30,0.1,6.1);
 129    TH1F *hfound=new TH1F("hfound","Found tracks",30,0.1,6.1);
 130    TH1F *hfake=new TH1F("hfake","Fake tracks",30,0.1,6.1);
 131    TH1F *hg=new TH1F("hg","",30,0.1,6.1); //efficiency for good tracks
 132    hg->SetLineColor(4); hg->SetLineWidth(2);
 133    TH1F *hf=new TH1F("hf","Efficiency for fake tracks",30,0.1,6.1);
 134    hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
 135    */
 136    TH1F *hgood=new TH1F("hgood","Good tracks",30,pmin,pmax);
 137    TH1F *hfound=new TH1F("hfound","Found tracks",30,pmin,pmax);
 138    TH1F *hfake=new TH1F("hfake","Fake tracks",30,pmin,pmax);
 139    TH1F *hg=new TH1F("hg","",30,pmin,pmax); //efficiency for good tracks
 140    hg->SetLineColor(4); hg->SetLineWidth(2);
 141    TH1F *hf=new TH1F("hf","Efficiency for fake tracks",30,pmin,pmax);
 142    hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
 143
 144    TH1F *he =new TH1F("he","dE/dX for pions with 0.4<p<0.5 GeV/c",50,0.,100.);
 145    TH2F *hep=new TH2F("hep","dE/dX vs momentum",50,0.,2.,50,0.,200.);
 146    hep->SetMarkerStyle(8);
 147    hep->SetMarkerSize(0.4);
 148
 149    Int_t mingood = ngood;  //MI change
 150    Int_t * track_notfound = new Int_t[ngood];
 151    Int_t   itrack_notfound =0;
 152    Int_t * track_fake  = new Int_t[ngood];
 153    Int_t   itrack_fake = 0;
 154    Int_t * track_multifound = new Int_t[ngood];
 155    Int_t * track_multifound_n = new Int_t[ngood];
 156    Int_t   itrack_multifound =0;
 157
 158    while (ngood--) {
 159       Int_t lab=gt[ngood].lab,tlab=-1;
 160       Float_t ptg=
 161       TMath::Sqrt(gt[ngood].px*gt[ngood].px + gt[ngood].py*gt[ngood].py);
 162
 163       if (ptg<pmin) continue;
 164       hgood->Fill(ptg);
 165
 166       AliTPCtrack *track=0;
 167       for (i=0; i<nentr; i++) {
 168           track=(AliTPCtrack*)tarray.UncheckedAt(i);
 169           tlab=track->GetLabel();
 170           if (lab==TMath::Abs(tlab)) break;
 171       }
 172       if (i==nentr) {
 173         //cerr<<"Track "<<lab<<" was not found !\n";
 174         track_notfound[itrack_notfound++]=lab;
 175         continue;
 176       }
 177
 178       //MI change  - addition
 179       Int_t micount=0;
 180       Int_t mi;
 181       AliTPCtrack * mitrack;
 182       for (mi=0; mi<nentr; mi++) {
 183         mitrack=(AliTPCtrack*)tarray.UncheckedAt(mi);
 184         if (lab==TMath::Abs(mitrack->GetLabel())) micount++;
 185       }
 186       if (micount>1) {
 187         //cout<<"Track no. "<<lab<<" found "<<micount<<"  times\n";
 188         track_multifound[itrack_multifound]=lab;
 189         track_multifound_n[itrack_multifound]=micount;
 190         itrack_multifound++;
 191       }
 192
 193
 194       //
 195       Double_t xk=gt[ngood].x;//digp->GetPadRowRadii(0,0);
 196       track->PropagateTo(xk);
 197
 198       if (lab==tlab) hfound->Fill(ptg);
 199       else {
 200         track_fake[itrack_fake++]=lab;
 201         hfake->Fill(ptg);
 202         //cerr<<lab<<" fake\n";
 203       }
 204
 205       Double_t par[5]; track->GetExternalParameters(xk,par);
 206       //cout<<"par = "<<par[0]<<" "<<par[1]<<" "<<par[2]<<" "<<par[3]<<" "<<par[4]
 207       //<<"\n"; getchar();
 208       Float_t phi=TMath::ASin(par[2]) + track->GetAlpha();
 209       if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
 210       if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
 211       Float_t lam=TMath::ATan(par[3]);
 212       Float_t pt_1=TMath::Abs(par[4]);
 213
 214       if (TMath::Abs(gt[ngood].code)==11 && ptg>4.) {
 215          hmpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
 216       } else {
 217          Float_t phig=TMath::ATan2(gt[ngood].py,gt[ngood].px);
 218          hp->Fill((phi - phig)*1000.);
 219
 220          Float_t lamg=TMath::ATan2(gt[ngood].pz,ptg);
 221          hl->Fill((lam - lamg)*1000.);
 222
 223          hpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
 224       }
 225
 226       Float_t mom=1./(pt_1*TMath::Cos(lam));
 227       Float_t dedx=track->GetdEdx();
 228       hep->Fill(mom,dedx,1.);
 229       if (TMath::Abs(gt[ngood].code)==211)
 230          if (mom>0.4 && mom<0.5) {
 231             he->Fill(dedx,1.);
 232          }
 233
 234    }
 235
 236
 237    Stat_t ng=hgood->GetEntries(); cerr<<"Good tracks "<<ng<<endl;
 238    Stat_t nf=hfound->GetEntries();
 239    if (ng!=0)
 240       cerr<<"\n\n\nIntegral efficiency is about "<<nf/ng*100.<<" %\n";
 241
 242    //MI change  - addition
 243    cout<<"Total number of found tracks ="<<nentr<<"\n";
 244    cout<<"Total number of \"good\" tracks ="<<mingood<<"\n";
 245
 246
 247    cout<<"\nList of Not found tracks :\n";
 248    //   Int_t i;
 249    for ( i = 0; i< itrack_notfound; i++){
 250      cout<<track_notfound[i]<<"\t";
 251      if ((i%5)==4) cout<<"\n";
 252    }
 253    cout<<"\nList of fake  tracks :\n";
 254    for ( i = 0; i< itrack_fake; i++){
 255      cout<<track_fake[i]<<"\t";
 256      if ((i%5)==4) cout<<"\n";
 257    }
 258     cout<<"\nList of multiple found tracks :\n";
 259    for ( i=0; i<itrack_multifound; i++) {
 260        cout<<"id.   "<<track_multifound[i]<<"     found - "<<track_multifound_n[i]<<"times\n";
 261    }
 262    cout<<"\n\n\n";
 263
 264
 265    gStyle->SetOptStat(111110);
 266    gStyle->SetOptFit(1);
 267
 268    TCanvas *c1=new TCanvas("c1","",0,0,700,850);
 269
 270    TPad *p1=new TPad("p1","",0,0.3,.5,.6); p1->Draw();
 271    p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10);
 272    hp->SetFillColor(4);  hp->SetXTitle("(mrad)"); hp->Fit("gaus"); c1->cd();
 273
 274    TPad *p2=new TPad("p2","",0.5,.3,1,.6); p2->Draw();
 275    p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10);
 276    hl->SetXTitle("(mrad)"); hl->Fit("gaus"); c1->cd();
 277
 278    TPad *p3=new TPad("p3","",0,0,0.5,0.3); p3->Draw();
 279    p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10);
 280    hpt->SetXTitle("(%)"); hpt->Fit("gaus"); c1->cd();
 281
 282    TPad *p4=new TPad("p4","",0.5,0,1,0.3); p4->Draw();
 283    p4->cd(); p4->SetFillColor(42); p4->SetFrameFillColor(10);
 284    hmpt->SetXTitle("(%)"); hmpt->Fit("gaus"); c1->cd();
 285
 286    TPad *p5=new TPad("p5","",0,0.6,1,1); p5->Draw(); p5->cd();
 287    p5->SetFillColor(41); p5->SetFrameFillColor(10);
 288    hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
 289    hg->Divide(hfound,hgood,1,1.,"b");
 290    hf->Divide(hfake,hgood,1,1.,"b");
 291    hg->SetMaximum(1.4);
 292    hg->SetYTitle("Tracking efficiency");
 293    hg->SetXTitle("Pt (GeV/c)");
 294    hg->Draw();
 295    /*
 296    TLine *line1 = new TLine(0,1.0,7,1.0); line1->SetLineStyle(4);
 297    line1->Draw("same");
 298    TLine *line2 = new TLine(0,0.9,7,0.9); line2->SetLineStyle(4);
 299    line2->Draw("same");
 300     */
 301    TLine *line1 = new TLine(pmin,1.0,pmax,1.0); line1->SetLineStyle(4);
 302    line1->Draw("same");
 303    TLine *line2 = new TLine(pmin,0.9,pmax,0.9); line2->SetLineStyle(4);
 304    line2->Draw("same");
 305
 306    hf->SetFillColor(1);
 307    hf->SetFillStyle(3013);
 308    hf->SetLineColor(2);
 309    hf->SetLineWidth(2);
 310    hf->Draw("histsame");
 311    TText *text = new TText(0.461176,0.248448,"Fake tracks");
 312    text->SetTextSize(0.05);
 313    text->Draw();
 314    text = new TText(0.453919,1.11408,"Good tracks");
 315    text->SetTextSize(0.05);
 316    text->Draw();
 317
 318
 319
 320    TCanvas *c2=new TCanvas("c2","",320,32,530,590);
 321
 322    TPad *p6=new TPad("p6","",0.,0.,1.,.5); p6->Draw();
 323    p6->cd(); p6->SetFillColor(42); p6->SetFrameFillColor(10);
 324    he->SetFillColor(2); he->SetFillStyle(3005);
 325    he->SetXTitle("Arbitrary Units");
 326    he->Fit("gaus"); c2->cd();
 327
 328    TPad *p7=new TPad("p7","",0.,0.5,1.,1.); p7->Draw();
 329    p7->cd(); p7->SetFillColor(42); p7->SetFrameFillColor(10);
 330    hep->SetXTitle("p (Gev/c)"); hep->SetYTitle("dE/dX (Arb. Units)");
 331    hep->Draw(); c1->cd();
 332
 333    gBenchmark->Stop("AliTPCComparison");
 334    gBenchmark->Show("AliTPCComparison");
 335
 336
 337    return 0;
 338 }
 339
 340
 341 Int_t good_tracks(GoodTrack *gt, Int_t max) {
 342    Int_t nt=0;
 343
 344    //TFile *file=TFile::Open("rfio:galice.root");
 345    TFile *file=TFile::Open("galice.root");
 346    if (!file->IsOpen()) {cerr<<"Can't open galice.root !\n"; exit(4);}
 347
 348    if (!(gAlice=(AliRun*)file->Get("gAlice"))) {
 349      cerr<<"gAlice have not been found on galice.root !\n";
 350      exit(5);
 351    }
 352
 353    Int_t np=gAlice->GetEvent(0);
 354
 355    AliTPC *TPC=(AliTPC*)gAlice->GetDetector("TPC");
 356    Int_t ver = TPC->IsVersion();
 357    cerr<<"TPC version "<<ver<<" has been found !\n";
 358
 359    AliTPCParam *digp=(AliTPCParam*)file->Get("75x40_100x60");
 360    if (!digp) { cerr<<"TPC parameters have not been found !\n"; exit(6); }
 361    TPC->SetParam(digp);
 362
 363    Int_t nrow_up=digp->GetNRowUp();
 364    Int_t nrows=digp->GetNRowLow()+nrow_up;
 365    Int_t zero=digp->GetZeroSup();
 366    Int_t gap=Int_t(0.125*nrows);
 367    Int_t good_number=Int_t(0.4*nrows);
 368
 369    Int_t *good=new Int_t[np];
 370    for (Int_t ii=0; ii<np; ii++) good[ii]=0;
 371
 372
 373    //MI change to be possible compile macro
 374    //definition out of the swith statemnet
 375     Int_t sectors_by_rows=0;
 376     TTree *TD=0;
 377     AliSimDigits da, *digits=&da;
 378     Int_t *count=0;
 379    switch (ver) {
 380    case 1:
 381      {
 382       TFile *cf=TFile::Open("AliTPCclusters.root");
 383       if (!cf->IsOpen()){cerr<<"Can't open AliTPCclusters.root !\n";exit(5);}
 384       AliTPCClustersArray *ca=new AliTPCClustersArray;
 385       ca->Setup(digp);
 386       ca->SetClusterType("AliTPCcluster");
 387       ca->ConnectTree("Segment Tree");
 388       Int_t nrows=Int_t(ca->GetTree()->GetEntries());
 389       for (Int_t n=0; n<nrows; n++) {
 390           AliSegmentID *s=ca->LoadEntry(n);
 391           Int_t sec,row;
 392           digp->AdjustSectorRow(s->GetID(),sec,row);
 393           AliTPCClustersRow &clrow = *ca->GetRow(sec,row);
 394           Int_t ncl=clrow.GetArray()->GetEntriesFast();
 395           while (ncl--) {
 396               AliTPCcluster *c=(AliTPCcluster*)clrow[ncl];
 397               Int_t lab=c->GetLabel(0);
 398               if (lab<0) continue; //noise cluster
 399               lab=TMath::Abs(lab);
 400               if (sec>=digp->GetNInnerSector())
 401               if (row==nrow_up-1    ) good[lab]|=0x1000;
 402               if (sec>=digp->GetNInnerSector())
 403               if (row==nrow_up-1-gap) good[lab]|=0x800;
 404               good[lab]++;
 405           }
 406           ca->ClearRow(sec,row);
 407       }
 408       cf->Close();
 409      }
 410       break;
 411    case 2:
 412       TD=(TTree*)gDirectory->Get("TreeD_75x40_100x60");
 413       TD->GetBranch("Segment")->SetAddress(&digits);
 414       count = new Int_t[np];
 415       Int_t i;
 416       for (i=0; i<np; i++) count[i]=0;
 417       sectors_by_rows=(Int_t)TD->GetEntries();
 418       for (i=0; i<sectors_by_rows; i++) {
 419           if (!TD->GetEvent(i)) continue;
 420           Int_t sec,row;
 421           digp->AdjustSectorRow(digits->GetID(),sec,row);
 422           cerr<<sec<<' '<<row<<"                                     \r";
 423           digits->First();
 424          // while (digits->Next()) {
 425           do { //Many thanks to J.Chudoba who noticed this
 426               Int_t it=digits->CurrentRow(), ip=digits->CurrentColumn();
 427               Short_t dig = digits->GetDigit(it,ip);
 428               Int_t idx0=digits->GetTrackID(it,ip,0);
 429               Int_t idx1=digits->GetTrackID(it,ip,1);
 430               Int_t idx2=digits->GetTrackID(it,ip,2);
 431               if (idx0>=0 && dig>=zero) count[idx0]+=1;
 432               if (idx1>=0 && dig>=zero) count[idx1]+=1;
 433               if (idx2>=0 && dig>=zero) count[idx2]+=1;
 434           } while (digits->Next());
 435           for (Int_t j=0; j<np; j++) {
 436               if (count[j]>1) {
 437                  if (sec>=digp->GetNInnerSector())
 438                    if (row==nrow_up-1    ) good[j]|=0x1000;
 439                  if (sec>=digp->GetNInnerSector())
 440                    if (row==nrow_up-1-gap) good[j]|=0x800;
 441                  good[j]++;
 442               }
 443               count[j]=0;
 444           }
 445       }
 446       delete[] count;
 447       break;
 448    default:
 449       cerr<<"Invalid TPC version !\n";
 450       file->Close();
 451       exit(7);
 452    }
 453
 454    TTree *TH=gAlice->TreeH();
 455    Int_t npart=(Int_t)TH->GetEntries();
 456
 457    while (npart--) {
 458       AliTPChit *hit0=0;
 459
 460       TPC->ResetHits();
 461       TH->GetEvent(npart);
 462       AliTPChit * hit = (AliTPChit*) TPC->FirstHit(-1);
 463       while (hit){
 464         if (hit->fQ==0.) break;
 465         hit =  (AliTPChit*) TPC->NextHit();
 466       }
 467       if (hit) {
 468         hit0 = new AliTPChit(*hit); //Make copy of hit
 469         hit = hit0;
 470       }
 471       else continue;
 472       AliTPChit *hit1=(AliTPChit*)TPC->NextHit();
 473       if (hit1==0) continue;
 474       if (hit1->fQ != 0.) continue;
 475       Int_t i=hit->Track();
 476       TParticle *p = (TParticle*)gAlice->Particle(i);
 477
 478       if (p->GetFirstMother()>=0) continue;  //secondary particle
 479       if (good[i] < 0x1000+0x800+2+good_number) continue;
 480       if (p->Pt()<0.100) continue;
 481       if (TMath::Abs(p->Pz()/p->Pt())>0.999) continue;
 482
 483       gt[nt].lab=i;
 484       gt[nt].code=p->GetPdgCode();
 485 //**** px py pz - in global coordinate system, x y z - in local !
 486       gt[nt].px=hit->X(); gt[nt].py=hit->Y(); gt[nt].pz=hit->Z();
 487       Float_t cs,sn; digp->AdjustCosSin(hit1->fSector,cs,sn);
 488       gt[nt].x = hit1->X()*cs + hit1->Y()*sn;
 489       gt[nt].y =-hit1->X()*sn + hit1->Y()*cs;
 490       gt[nt].z = hit1->Z();
 491       gt[nt].pxg = p->Px();
 492       gt[nt].pyg = p->Py();
 493       gt[nt].pzg = p->Pz();
 494       gt[nt].ptg = p->Pt();
 495       gt[nt].flag = 0;
 496       nt++;
 497         if (hit0) delete hit0;
 498       cerr<<i<<"                \r";
 499       if (nt==max) {cerr<<"Too many good tracks !\n"; break;}
 500    }
 501    delete[] good;
 502
 503    delete gAlice; gAlice=0;
 504
 505    file->Close();
 506    gBenchmark->Stop("AliTPCComparison");
 507    gBenchmark->Show("AliTPCComparison");
 508    return nt;
 509 }
 510
 511
 512