#include <TTree.h>
#include <TClonesArray.h>
#include "AliLog.h"
#include "AliESDEvent.h"
#include "AliITSUClusterPix.h"
#include "AliITSUTrackerCooked.h"
#include "AliITSUTrackCooked.h"
#include "AliITSUReconstructor.h"
ClassImp(AliITSUTrackerCooked)
const Double_t kzWin=0.33;
const Double_t kminPt=0.05;
const Double_t kmaxDCAxy=3.;
const Double_t kmaxDCAz= 3.;
const Int_t kSeedingLayer1=6, kSeedingLayer2=4, kSeedingLayer3=5;
const Double_t kSigma2=0.0005*0.0005;
const Double_t kmaxChi2PerCluster=20.;
const Double_t kmaxChi2PerTrack=30.;
const Double_t kRoadY=0.7;
const Double_t kRoadZ=0.7;
const Int_t kminNumberOfClusters=4;
AliITSUTrackerCooked::AliITSUlayer
AliITSUTrackerCooked::fgLayers[AliITSUTrackerCooked::kNLayers];
AliITSUTrackerCooked::AliITSUTrackerCooked(AliITSUReconstructor *rec):
AliITSUTrackerGlo(rec),
fSeeds(0),
fI(kNLayers-1),
fBestTrack(0),
fTrackToFollow(0),
fSAonly(kTRUE)
{
const Double_t
klRadius[7]={2.34, 3.15, 3.93, 19.61, 24.55, 34.39, 39.34};
for (Int_t i=0; i<kNLayers; i++) fgLayers[i].SetR(klRadius[i]);
Double_t xyz[]={0.,0.,0.};
Double_t ers[]={2.,2.,2.};
SetVertex(xyz,ers);
}
void AliITSUTrackerCooked::ResetTrackToFollow(const AliITSUTrackCooked &t) {
delete fTrackToFollow;
fTrackToFollow = new AliITSUTrackCooked(t);
}
void AliITSUTrackerCooked::ResetBestTrack() {
delete fBestTrack;
fBestTrack = new AliITSUTrackCooked(*fTrackToFollow);
}
AliITSUTrackerCooked::~AliITSUTrackerCooked()
{
if (fSeeds) fSeeds->Delete(); delete fSeeds;
delete fBestTrack;
delete fTrackToFollow;
}
static Double_t
f1(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t x3, Double_t y3)
{
Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
(y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
(x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
Double_t xr=TMath::Abs(d/(d*x1-a)), yr=TMath::Abs(d/(d*y1-b));
Double_t crv=xr*yr/sqrt(xr*xr+yr*yr);
if (d>0) crv=-crv;
return crv;
}
static Double_t
f2(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t x3, Double_t y3)
{
Double_t k1=(y2-y1)/(x2-x1), k2=(y3-y2)/(x3-x2);
Double_t x0=0.5*(k1*k2*(y1-y3) + k2*(x1+x2) - k1*(x2+x3))/(k2-k1);
return x0;
}
static Double_t
f3(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t z1, Double_t z2)
{
return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
}
Bool_t AliITSUTrackerCooked::
AddCookedSeed(const Float_t r1[3], Int_t l1, Int_t i1,
const Float_t r2[3], Int_t l2, Int_t i2,
const AliCluster *c3,Int_t l3, Int_t i3)
{
Float_t x,a;
if (!c3->GetXAlphaRefPlane(x,a)) return kFALSE;
Double_t ca=TMath::Cos(a), sa=TMath::Sin(a);
Double_t x1 = r1[0]*ca + r1[1]*sa,
y1 =-r1[0]*sa + r1[1]*ca, z1 = r1[2];
Double_t x2 = r2[0]*ca + r2[1]*sa,
y2 =-r2[0]*sa + r2[1]*ca, z2 = r2[2];
Double_t x3 = x, y3 = c3->GetY(), z3 = c3->GetZ();
Double_t par[5];
par[0]=y3;
par[1]=z3;
Double_t crv=f1(x1, y1, x2, y2, x3, y3);
Double_t x0 =f2(x1, y1, x2, y2, x3, y3);
Double_t tgl12=f3(x1, y1, x2, y2, z1, z2);
Double_t tgl23=f3(x2, y2, x3, y3, z2, z3);
Double_t sf=crv*(x-x0);
if (TMath::Abs(sf) >= kAlmost1) return kFALSE;
par[2]=sf;
par[3]=0.5*(tgl12 + tgl23);
Double_t bz=GetBz();
par[4]=(TMath::Abs(bz) < kAlmost0Field) ? kAlmost0 : crv/(bz*kB2C);
Double_t cov[15];
const Double_t dlt=0.0005;
Double_t
fy=1./(fgLayers[kSeedingLayer3].GetR() - fgLayers[kSeedingLayer2].GetR());
Double_t tz=fy;
Double_t cy=(f1(x1, y1, x2, y2+dlt, x3, y3) - crv)/dlt/bz/kB2C;
cy*=20;
Double_t s2=kSigma2;
cov[0]=s2;
cov[1]=0.; cov[2]=s2;
cov[3]=s2*fy; cov[4]=0.; cov[5]=s2*fy*fy;
cov[6]=0.; cov[7]=s2*tz; cov[8]=0.; cov[9]=s2*tz*tz;
cov[10]=s2*cy; cov[11]=0.; cov[12]=s2*fy*cy; cov[13]=0.; cov[14]=s2*cy*cy;
AliITSUTrackCooked *seed=new AliITSUTrackCooked();
seed->Set(Double_t(x), Double_t(a), par, cov);
Float_t dz[2];
seed->GetDZ(GetX(),GetY(),GetZ(),GetBz(),dz);
if (TMath::Abs(dz[0]) > kmaxDCAxy) {delete seed; return kFALSE;}
if (TMath::Abs(dz[1]) > kmaxDCAz ) {delete seed; return kFALSE;}
Double_t xx0 = 0.008;
Double_t radl= 9.36;
Double_t rho = 2.33;
Double_t mass= 0.139;
if (!seed->CorrectForMeanMaterial(xx0, xx0*radl*rho, mass, kTRUE)) {
delete seed; return kFALSE;
}
seed->SetClusterIndex(l1,i1);
seed->SetClusterIndex(l2,i2);
seed->SetClusterIndex(l3,i3);
fSeeds->AddLast(seed);
return kTRUE;
}
Int_t AliITSUTrackerCooked::MakeSeeds() {
const Double_t zv=GetZ();
AliITSUlayer &layer1=fgLayers[kSeedingLayer1];
AliITSUlayer &layer2=fgLayers[kSeedingLayer2];
AliITSUlayer &layer3=fgLayers[kSeedingLayer3];
Double_t r1=layer1.GetR();
Double_t r2=layer2.GetR();
Double_t r3=layer3.GetR();
const Double_t maxC = TMath::Abs(GetBz()*kB2C/kminPt);
const Double_t kpWin = TMath::ASin(0.5*maxC*r1) - TMath::ASin(0.5*maxC*r2);
Int_t nClusters1=layer1.GetNumberOfClusters();
Int_t nClusters2=layer2.GetNumberOfClusters();
Int_t nClusters3=layer3.GetNumberOfClusters();
for (Int_t n1=0; n1<nClusters1; n1++) {
AliCluster *c1=layer1.GetCluster(n1);
Double_t z1=c1->GetZ();
Float_t xyz1[3]; c1->GetGlobalXYZ(xyz1);
Double_t phi1=layer1.GetClusterPhi(n1);
Double_t zr2=zv + r2/r1*(z1-zv);
Int_t start2=layer2.FindClusterIndex(zr2-kzWin);
for (Int_t n2=start2; n2<nClusters2; n2++) {
AliCluster *c2=layer2.GetCluster(n2);
Double_t z2=c2->GetZ();
if (z2 > (zr2+kzWin)) break;
Float_t xyz2[3]; c2->GetGlobalXYZ(xyz2);
Double_t phi2=layer2.GetClusterPhi(n2);
if (TMath::Abs(phi2-phi1) > kpWin) continue;
Double_t zr3=z1 + (r3-r1)/(r2-r1)*(z2-z1);
Double_t crv=f1(xyz1[0], xyz1[1], xyz2[0], xyz2[1], GetX(), GetY());
Double_t phir3 = phi1 + 0.5*crv*(r3 - r1);
Int_t start3=layer3.FindClusterIndex(zr3-kzWin/2);
for (Int_t n3=start3; n3<nClusters3; n3++) {
AliCluster *c3=layer3.GetCluster(n3);
Double_t z3=c3->GetZ();
if (z3 > (zr3+kzWin/2)) break;
Float_t xyz3[3]; c3->GetGlobalXYZ(xyz3);
Double_t phi3=layer3.GetClusterPhi(n3);
if (TMath::Abs(phir3-phi3) > kpWin/100) continue;
AliITSUClusterPix cc(*((AliITSUClusterPix*)c2));
cc.GoToFrameTrk();
AddCookedSeed(xyz1, kSeedingLayer1, n1,
xyz3, kSeedingLayer3, n3,
&cc, kSeedingLayer2, n2);
}
}
}
for (Int_t n1=0; n1<nClusters1; n1++) {
AliCluster *c1=layer1.GetCluster(n1);
((AliITSUClusterPix*)c1)->GoToFrameTrk();
}
for (Int_t n2=0; n2<nClusters2; n2++) {
AliCluster *c2=layer2.GetCluster(n2);
((AliITSUClusterPix*)c2)->GoToFrameTrk();
}
for (Int_t n3=0; n3<nClusters3; n3++) {
AliCluster *c3=layer3.GetCluster(n3);
((AliITSUClusterPix*)c3)->GoToFrameTrk();
}
return fSeeds->GetEntriesFast();
}
Int_t AliITSUTrackerCooked::Clusters2Tracks(AliESDEvent *event) {
if (!fSAonly) AliITSUTrackerGlo::Clusters2Tracks(event);
if (fSeeds) {fSeeds->Delete(); delete fSeeds;}
fSeeds=new TObjArray(77777);
Double_t xyz[3];
const AliESDVertex *vtx=0;
vtx=event->GetPrimaryVertexSPD();
if (vtx->GetStatus()) {
xyz[0]=vtx->GetX(); xyz[1]=vtx->GetY(); xyz[2]=vtx->GetZ();
SetVertex(xyz);
MakeSeeds();
}
TClonesArray *verticesSPD=event->GetPileupVerticesSPD();
Int_t nfoundSPD=verticesSPD->GetEntries();
for (Int_t v=0; v<nfoundSPD; v++) {
vtx=(AliESDVertex *)verticesSPD->UncheckedAt(v);
if (!vtx->GetStatus()) continue;
xyz[0]=vtx->GetX(); xyz[1]=vtx->GetY(); xyz[2]=vtx->GetZ();
SetVertex(xyz);
MakeSeeds();
}
fSeeds->Sort();
Int_t nSeeds=fSeeds->GetEntriesFast();
Int_t ngood=0;
for (Int_t s=0; s<nSeeds; s++) {
const AliITSUTrackCooked *track=(AliITSUTrackCooked*)fSeeds->At(s);
Double_t x=track->GetX();
Double_t y=track->GetY();
Double_t phi=track->GetAlpha() + TMath::ATan2(y,x);
const Float_t pi2 = 2.*TMath::Pi();
if (phi<0.) phi+=pi2;
else if (phi >= pi2) phi-=pi2;
for (Int_t n=0; n<kNLayers-3; n++) {
Double_t z;
track->GetZAt(fgLayers[n].GetR(),GetBz(),z);
fgLayers[n].SelectClusters(phi,kRoadY,z,kRoadZ);
}
ResetTrackToFollow(*track);
ResetBestTrack();
fI=kSeedingLayer2;
fgLayers[fI].ResetTrack(*track);
for (FollowProlongation(); fI<kSeedingLayer2; fI++) {
while (TakeNextProlongation()) FollowProlongation();
}
if (fBestTrack->GetNumberOfClusters() < kminNumberOfClusters) continue;
CookLabel(fBestTrack,0.);
Int_t label=fBestTrack->GetLabel();
if (label>0) ngood++;
AliESDtrack iotrack;
iotrack.UpdateTrackParams(fBestTrack,AliESDtrack::kITSin);
iotrack.SetLabel(label);
event->AddTrack(&iotrack);
UseClusters(fBestTrack);
}
Info("Clusters2Tracks","Seeds: %d",nSeeds);
if (nSeeds)
Info("Clusters2Tracks","Good tracks/seeds: %f",Float_t(ngood)/nSeeds);
if (fSeeds) {fSeeds->Delete(); delete fSeeds;}
fSeeds=0;
return 0;
}
void AliITSUTrackerCooked::FollowProlongation() {
while (fI) {
fI--;
fgLayers[fI].ResetSelectedClusters();
if (!TakeNextProlongation()) return;
}
Int_t ncl=fTrackToFollow->GetNumberOfClusters();
Int_t nclb=fBestTrack->GetNumberOfClusters();
if (ncl >= nclb) {
Double_t chi2=fTrackToFollow->GetChi2();
if (chi2 < kmaxChi2PerTrack) {
if (ncl > nclb || chi2 < fBestTrack->GetChi2()) {
ResetBestTrack();
}
}
}
}
Int_t AliITSUTrackerCooked::TakeNextProlongation() {
AliITSUlayer &layer=fgLayers[fI];
const AliCluster *c=0; Int_t ci=-1;
const AliCluster *cc=0; Int_t cci=-1;
UShort_t volId=-1;
Double_t z=0., dz=0., y=0., dy=0., chi2=0.;
while ((c=layer.GetNextCluster(ci))!=0) {
Int_t id=c->GetVolumeId();
if (id != volId) {
volId=id;
const AliITSUTrackCooked *t = fgLayers[fI+1].GetTrack();
ResetTrackToFollow(*t);
Double_t x=layer.GetXRef(ci);
Double_t alpha=layer.GetAlphaRef(ci);
if (!fTrackToFollow->Propagate(alpha, x, GetBz())) {
continue;
}
dz=7*TMath::Sqrt(fTrackToFollow->GetSigmaZ2() + kSigma2);
dy=7*TMath::Sqrt(fTrackToFollow->GetSigmaY2() + kSigma2);
z=fTrackToFollow->GetZ();
y=fTrackToFollow->GetY();
}
if (TMath::Abs(z - c->GetZ()) > dz) continue;
if (TMath::Abs(y - c->GetY()) > dy) continue;
Double_t ch2=fTrackToFollow->GetPredictedChi2(c);
if (ch2 > kmaxChi2PerCluster) continue;
chi2=ch2;
cc=c; cci=ci;
break;
}
if (!cc) return 0;
if (!fTrackToFollow->Update(cc,chi2,(fI<<28)+cci)) {
return 0;
}
Double_t xx0 = (fI > 2) ? 0.008 : 0.003;
Double_t x0 = 9.36;
Double_t rho = 2.33;
Double_t mass = fTrackToFollow->GetMass();
fTrackToFollow->CorrectForMeanMaterial(xx0, xx0*x0*rho, mass, kTRUE);
layer.ResetTrack(*fTrackToFollow);
return 1;
}
Int_t AliITSUTrackerCooked::PropagateBack(AliESDEvent *event) {
Int_t n=event->GetNumberOfTracks();
Int_t ntrk=0;
Int_t ngood=0;
for (Int_t i=0; i<n; i++) {
AliESDtrack *esdTrack=event->GetTrack(i);
if (!esdTrack->IsOn(AliESDtrack::kITSin)) continue;
if ( esdTrack->IsOn(AliESDtrack::kTPCin)) continue;
AliITSUTrackCooked track(*esdTrack);
ResetTrackToFollow(track);
fTrackToFollow->ResetCovariance(10.); fTrackToFollow->ResetClusters();
if (RefitAt(40., fTrackToFollow, &track)) {
CookLabel(fTrackToFollow, 0.);
Int_t label=fTrackToFollow->GetLabel();
if (label>0) ngood++;
esdTrack->UpdateTrackParams(fTrackToFollow,AliESDtrack::kITSout);
ntrk++;
}
}
Info("PropagateBack","Back propagated tracks: %d",ntrk);
if (ntrk)
Info("PropagateBack","Good tracks/back propagated: %f",Float_t(ngood)/ntrk);
if (!fSAonly) AliITSUTrackerGlo::PropagateBack(event);
return 0;
}
Bool_t AliITSUTrackerCooked::
RefitAt(Double_t xx, AliITSUTrackCooked *t, const AliITSUTrackCooked *c) {
Int_t index[kNLayers];
Int_t k;
for (k=0; k<kNLayers; k++) index[k]=-1;
Int_t nc=c->GetNumberOfClusters();
for (k=0; k<nc; k++) {
Int_t idx=c->GetClusterIndex(k), nl=(idx&0xf0000000)>>28;
index[nl]=idx;
}
Int_t from, to, step;
if (xx > t->GetX()) {
from=0; to=kNLayers;
step=+1;
} else {
from=kNLayers-1; to=-1;
step=-1;
}
for (Int_t i=from; i != to; i += step) {
Int_t idx=index[i];
if (idx>=0) {
const AliCluster *cl=GetCluster(idx);
Float_t xr,ar; cl->GetXAlphaRefPlane(xr, ar);
if (!t->Propagate(Double_t(ar), Double_t(xr), GetBz())) {
return kFALSE;
}
Double_t chi2=t->GetPredictedChi2(cl);
if (chi2 < kmaxChi2PerCluster) t->Update(cl, chi2, idx);
} else {
Double_t r=fgLayers[i].GetR();
Double_t phi,z;
if (!t->GetPhiZat(r,phi,z)) {
return kFALSE;
}
if (!t->Propagate(phi, r, GetBz())) {
return kFALSE;
}
}
Double_t xx0 = (i > 2) ? 0.008 : 0.003;
Double_t x0 = 9.36;
Double_t rho = 2.33;
Double_t mass = t->GetMass();
t->CorrectForMeanMaterial(xx0, -step*xx0*x0*rho, mass, kTRUE);
}
if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
return kTRUE;
}
Int_t AliITSUTrackerCooked::RefitInward(AliESDEvent *event) {
Int_t n=event->GetNumberOfTracks();
Int_t ntrk=0;
Int_t ngood=0;
for (Int_t i=0; i<n; i++) {
AliESDtrack *esdTrack=event->GetTrack(i);
if (!esdTrack->IsOn(AliESDtrack::kITSout)) continue;
if ( esdTrack->IsOn(AliESDtrack::kTPCin)) continue;
AliITSUTrackCooked track(*esdTrack);
ResetTrackToFollow(track);
fTrackToFollow->ResetCovariance(10.); fTrackToFollow->ResetClusters();
if (!RefitAt(2.1, fTrackToFollow, &track)) continue;
if (!fTrackToFollow->PropagateTo(1.8, 2.27e-3, 35.28*1.848)) continue;
CookLabel(fTrackToFollow, 0.);
Int_t label=fTrackToFollow->GetLabel();
if (label>0) ngood++;
esdTrack->UpdateTrackParams(fTrackToFollow,AliESDtrack::kITSrefit);
ntrk++;
}
Info("RefitInward","Refitted tracks: %d",ntrk);
if (ntrk)
Info("RefitInward","Good tracks/refitted: %f",Float_t(ngood)/ntrk);
if (!fSAonly) AliITSUTrackerGlo::RefitInward(event);
return 0;
}
Int_t AliITSUTrackerCooked::LoadClusters(TTree *cTree) {
if (!cTree) {
AliFatal("No cluster tree !");
return 1;
}
AliITSUTrackerGlo::LoadClusters(cTree);
for (Int_t i=0; i<kNLayers; i++) {
TClonesArray *clusters=fReconstructor->GetClusters(i);
switch (i) {
case kSeedingLayer1:
case kSeedingLayer2:
case kSeedingLayer3:
fgLayers[i].InsertClusters(clusters,kTRUE,fSAonly);
break;
default:
fgLayers[i].InsertClusters(clusters,kFALSE,fSAonly);
break;
}
}
return 0;
}
void AliITSUTrackerCooked::UnloadClusters() {
AliITSUTrackerGlo::UnloadClusters();
for (Int_t i=0; i<kNLayers; i++) fgLayers[i].DeleteClusters();
}
AliCluster *AliITSUTrackerCooked::GetCluster(Int_t index) const {
Int_t l=(index & 0xf0000000) >> 28;
Int_t c=(index & 0x0fffffff) >> 00;
return fgLayers[l].GetCluster(c);
}
AliITSUTrackerCooked::AliITSUlayer::AliITSUlayer():
fR(0),
fN(0),
fNsel(0),
fI(0),
fTrack(0)
{
for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0;
for (Int_t i=0; i<kMaxSelected; i++) fIndex[i]=-1;
}
AliITSUTrackerCooked::AliITSUlayer::~AliITSUlayer()
{
delete fTrack;
}
void
AliITSUTrackerCooked::AliITSUlayer::ResetTrack(const AliITSUTrackCooked &t) {
delete fTrack;
fTrack=new AliITSUTrackCooked(t);
}
void AliITSUTrackerCooked::AliITSUlayer::
InsertClusters(TClonesArray *clusters, Bool_t seedingLayer, Bool_t saOnly)
{
Int_t ncl=clusters->GetEntriesFast();
Double_t r=0.;
for (Int_t i=0; i<ncl; i++) {
AliITSUClusterPix *c=(AliITSUClusterPix*)clusters->UncheckedAt(i);
if (!saOnly) if (c->IsClusterUsed()) continue;
c->GoToFrameGlo();
Double_t x=c->GetX(), y=c->GetY();
r += TMath::Sqrt(x*x + y*y);
if (!seedingLayer) c->GoToFrameTrk();
if (InsertCluster(c)) break;
}
if (fN) fR = r/fN;
const Float_t pi2 = 2.*TMath::Pi();
for (Int_t i=0; i<fN; i++) {
AliCluster *c=fClusters[i];
c->GetXAlphaRefPlane(fXRef[i],fAlphaRef[i]);
Float_t xyz[3]; c->GetGlobalXYZ(xyz);
Float_t phi=TMath::ATan2(xyz[1],xyz[0]);
if (phi<0.) phi+=pi2;
else if (phi >= pi2) phi-=pi2;
fPhi[i]=phi;
}
}
void AliITSUTrackerCooked::AliITSUlayer::DeleteClusters()
{
fN=0;
}
Int_t
AliITSUTrackerCooked::AliITSUlayer::InsertCluster(AliCluster *c) {
if (fN>=kMaxClusterPerLayer) {
::Error("InsertCluster","Too many clusters !\n");
return 1;
}
if (fN==0) fClusters[0]=c;
else {
Int_t i=FindClusterIndex(c->GetZ());
Int_t k=fN-i;
memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliCluster*));
fClusters[i]=c;
}
fN++;
return 0;
}
Int_t
AliITSUTrackerCooked::AliITSUlayer::FindClusterIndex(Double_t z) const {
if (fN==0) return 0;
Int_t b=0;
if (z <= fClusters[b]->GetZ()) return b;
Int_t e=b+fN-1;
if (z > fClusters[e]->GetZ()) return e+1;
Int_t m=(b+e)/2;
for (; b<e; m=(b+e)/2) {
if (z > fClusters[m]->GetZ()) b=m+1;
else e=m;
}
return m;
}
void AliITSUTrackerCooked::AliITSUlayer::
SelectClusters(Float_t phi, Float_t dy, Float_t z, Float_t dz) {
fNsel=0;
Float_t dphi=dy/fR;
Float_t phiMin=phi-dphi;
Float_t phiMax=phi+dphi;
Float_t zMin=z-dz;
Float_t zMax=z+dz;
Int_t i=FindClusterIndex(zMin), imax=FindClusterIndex(zMax);
for (; i<imax; i++) {
Float_t cphi=fPhi[i];
if (cphi <= phiMin) continue;
if (cphi > phiMax) continue;
AliCluster *c=fClusters[i];
if (c->IsClusterUsed()) continue;
fIndex[fNsel++]=i;
if (fNsel>=kMaxSelected) break;
}
}
const AliCluster *AliITSUTrackerCooked::AliITSUlayer::GetNextCluster(Int_t &ci){
if (fI<fNsel) {
ci=fIndex[fI++];
return fClusters[ci];
}
ci=-1;
return 0;
}
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