[u/mrichter/AliRoot.git] / ITS / AliITSdEdxAnalyzer.cxx

/**************************************************************************
 * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////
//                                                               //
// Implementation of the base class for dEdx analysis            //
// Origin: F.Prino, Torino, prino@to.infn.it                     //
//                                                               //
///////////////////////////////////////////////////////////////////

#include <TString.h>
#include <TFile.h>
#include <TParticlePDG.h>
#include <TDatabasePDG.h>
#include "AliITSdEdxAnalyzer.h"
#include "AliExternalTrackParam.h"
#include "AliITSpidESD.h"
#include "AliPID.h"

ClassImp(AliITSdEdxAnalyzer)

const Int_t AliITSdEdxAnalyzer::fgkPdgCode[kNParticles]={211,321,2212};
const Int_t AliITSdEdxAnalyzer::fgkLayerCode[kNValuesdEdx]={3,4,5,6,0};

//______________________________________________________________________
AliITSdEdxAnalyzer::AliITSdEdxAnalyzer() :  
  TObject(),
  fNPBins(10),
  fPMin(0.1),
  fPMax(1.1),
  fHistodEdx(0),
  fHistoDeltadEdx(0),
  fHistodEdxVsP(0),
  fThickness(0.03),
  fDensity(2.33),
  fBBmodel(0),
  fMIP(82.),
  fTPCpidCut(0.5)
{
  // default constructor
  BookHistos();
}
//______________________________________________________________________
AliITSdEdxAnalyzer::AliITSdEdxAnalyzer(const Int_t npbins, const Float_t pmin, const Float_t pmax) :  
  TObject(),
  fNPBins(npbins),
  fPMin(pmin),
  fPMax(pmax),
  fHistodEdx(0),
  fHistoDeltadEdx(0),
  fHistodEdxVsP(0),
  fThickness(0.03),
  fDensity(2.33),
  fBBmodel(0),
  fMIP(82.),
  fTPCpidCut(0.5)
{
  // standard constructor
  BookHistos();
}
//______________________________________________________________________
AliITSdEdxAnalyzer::~AliITSdEdxAnalyzer(){
  // destructor
  DeleteHistos();
}
//______________________________________________________________________
void AliITSdEdxAnalyzer::SetMomentumBins(const Int_t npbins, const Float_t pmin, const Float_t pmax){
  // Kill exisiting histos, set new binning, book new histos
  DeleteHistos();
  fNPBins=npbins;
  fPMin=pmin;
  fPMax=pmax;
  BookHistos();
}
//______________________________________________________________________
void AliITSdEdxAnalyzer::DeleteHistos(){
  //
  if(fHistodEdx){
    for(Int_t i=0; i<GetNHistos();i++) delete fHistodEdx[i];
    delete [] fHistodEdx;
    fHistodEdx=0;
  }
  if(fHistoDeltadEdx){
    for(Int_t i=0; i<GetNHistos();i++) delete fHistoDeltadEdx[i];
    delete [] fHistoDeltadEdx;
    fHistoDeltadEdx=0;
  }
  if(fHistodEdxVsP){
    for(Int_t i=0; i<GetNHistos2();i++) delete fHistodEdxVsP[i];
    delete [] fHistodEdxVsP;
    fHistodEdxVsP=0;
  }
}
//______________________________________________________________________
void AliITSdEdxAnalyzer::BookHistos(){
  //
  fHistodEdx=new TH1F*[GetNHistos()];
  fHistoDeltadEdx=new TH1F*[GetNHistos()];
  for(Int_t iSpecie=0; iSpecie<kNParticles; iSpecie++){
    for(Int_t iPBin=0; iPBin<fNPBins; iPBin++){
      for(Int_t iVal=0; iVal<kNValuesdEdx; iVal++){
	TString hisnam1=Form("hdEdx%dpbin%dpart%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
	TString histit1=Form("dEdx layer %d (keV) pbin%d part%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
	if(iVal==kNValuesdEdx-1) histit1=Form("dEdx trunc. mean (keV) pbin%d part%d",iPBin,fgkPdgCode[iSpecie]);
	fHistodEdx[GetIndex(iSpecie,iPBin,iVal)]=new TH1F(hisnam1.Data(),histit1.Data(),100,0.,500.);
	fHistodEdx[GetIndex(iSpecie,iPBin,iVal)]->GetXaxis()->SetTitle(histit1.Data());
	TString hisnam2=Form("hdeltadEdx%dpbin%dpart%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
	TString histit2=Form("(dEdx_l%d-BetheBloch)/BetheBloch pbin%d part%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
	if(iVal==kNValuesdEdx-1) histit1=Form("(dEdx_truncmean-BetheBloch)/BetheBloch pbin%d part%d",iPBin,fgkPdgCode[iSpecie]);
	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,iVal)]=new TH1F(hisnam2.Data(),histit2.Data(),100,-0.5,0.5);
	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,iVal)]->GetXaxis()->SetTitle(histit2.Data());
      }
    }
  }

  fHistodEdxVsP=new TH2F*[GetNHistos2()];
  for(Int_t iSpecie=0; iSpecie<kNParticles; iSpecie++){
    for(Int_t iVal=0; iVal<kNValuesdEdx; iVal++){
      TString hisnam=Form("hdEdx%dVsPpart%d",fgkLayerCode[iVal],fgkPdgCode[iSpecie]);
      TString histit=Form("dEdx layer %d (keV) vs P part%d",fgkLayerCode[iVal],fgkPdgCode[iSpecie]);
      if(iVal==kNValuesdEdx-1) histit=Form("dEdx trunc. mean (keV) vs P part%d",fgkPdgCode[iSpecie]);      
      fHistodEdxVsP[GetIndex2(iSpecie,iVal)]=new TH2F(hisnam.Data(),histit.Data(),50,fPMin,fPMax,50,0.,500.);
      histit.ReplaceAll(" vs P "," ");
      fHistodEdxVsP[GetIndex2(iSpecie,iVal)]->GetYaxis()->SetTitle(histit.Data());
      fHistodEdxVsP[GetIndex2(iSpecie,iVal)]->GetXaxis()->SetTitle("Momentum (GeV/c)");
    }
  }
}
//______________________________________________________________________
void AliITSdEdxAnalyzer:: WriteHistos(TString filename) const {
  TFile *outfile=new TFile(filename.Data(),"recreate");
  outfile->cd();
  for(Int_t i=0; i<GetNHistos();i++){ 
    fHistodEdx[i]->Write();
    fHistoDeltadEdx[i]->Write();
  }
  for(Int_t i=0; i<GetNHistos2();i++) fHistodEdxVsP[i]->Write();
  outfile->Close();
  delete outfile;
}
//______________________________________________________________________
void AliITSdEdxAnalyzer::ReadEvent(AliESDEvent* esd, AliStack* stack){
  // Fill histos 
  // if stack is !=0 MC truth is used to define particle specie
  // else TPC pid is used to define particle specie

  if(!esd) AliFatal("Bad ESD event");
  for (Int_t iTrack = 0; iTrack < esd->GetNumberOfTracks(); iTrack++) {
    AliESDtrack* track = esd->GetTrack(iTrack);
    Double_t trmean=track->GetITSsignal();
    Double_t sig[4];
    track->GetITSdEdxSamples(sig);
    Double_t preco=track->P();
    Int_t iPBin=GetMomentumBin(preco);
    if(iPBin==-1) continue;
    Int_t iSpecie=-1;
    Double_t dedxbb=0;
    if(stack){
      Int_t lab=track->GetLabel();
      if(lab<0) continue;
      TParticle* part=(TParticle*)stack->Particle(lab);
      Int_t absPdgCode=TMath::Abs(part->GetPdgCode());
      iSpecie=GetSpecieBin(absPdgCode);
      if(iSpecie==-1) continue;
      dedxbb=BetheBloch(part);
    }else{   
      iSpecie=GetPaticleIdFromTPC(track);
      if(iSpecie==-1) continue;
      TParticlePDG* p=TDatabasePDG::Instance()->GetParticle(fgkPdgCode[iSpecie]);    
      dedxbb=BetheBloch(preco,p->Mass());
    }
    for(Int_t ilay=0;ilay<4;ilay++){    
      if(sig[ilay]>0.){
	fHistodEdx[GetIndex(iSpecie,iPBin,ilay)]->Fill(sig[ilay]);
	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,ilay)]->Fill((sig[ilay]-dedxbb)/dedxbb);
	fHistodEdxVsP[GetIndex2(iSpecie,ilay)]->Fill(preco,sig[ilay]);
      }
    }
    if(trmean>0.){
      fHistodEdx[GetIndex(iSpecie,iPBin,4)]->Fill(trmean);
      fHistoDeltadEdx[GetIndex(iSpecie,iPBin,4)]->Fill((trmean-dedxbb)/dedxbb);
      fHistodEdxVsP[GetIndex2(iSpecie,4)]->Fill(preco,trmean);
    }
  }
}
//______________________________________________________________________
Int_t AliITSdEdxAnalyzer::GetPaticleIdFromTPC(const AliESDtrack* track) const {
  //
  Double_t tpcpid[AliPID::kSPECIES];
  track->GetTPCpid(tpcpid);
  Int_t maxPos=-1;
  Float_t maxProb=0.;
  for(Int_t is=0; is<AliPID::kSPECIES; is++){
    if(tpcpid[is]>maxProb){
      maxProb=tpcpid[is];
      maxPos=is;
    }
  }
  Int_t iSpecie=-1;
  if(maxProb>fTPCpidCut){
    if(maxPos==AliPID::kPion) iSpecie=0;
    else if(maxPos==AliPID::kKaon) iSpecie=1;
    else if(maxPos==AliPID::kProton) iSpecie=2;    
  }
  return iSpecie;
}
//______________________________________________________________________
Double_t AliITSdEdxAnalyzer::BetheBloch(const Float_t p, const Float_t m) const {
  //
  Double_t dedxbb=0.;
  if(fBBmodel==0){
    Double_t betagamma=p/m;
    Double_t conv=fDensity*1E6*fThickness/116.24*fMIP;
    dedxbb=conv*AliExternalTrackParam::BetheBlochSolid(betagamma);
  }else if(fBBmodel==1){
    dedxbb=fMIP*AliITSpidESD::Bethe(p,m);
  }
  return dedxbb;
}
//______________________________________________________________________
TGraph* AliITSdEdxAnalyzer::GetBetheBlochGraph(const Int_t pdgcode) const {
 // Fills a TGraph with Bethe-Bloch expe
 TGraph* g=new TGraph(0);
 TParticlePDG* part=TDatabasePDG::Instance()->GetParticle(pdgcode);
 Float_t mass=part->Mass();
 for(Int_t ip=0; ip<100;ip++){
   Float_t p=fPMin+(ip+0.5)*(fPMax-fPMin)/100.;
   g->SetPoint(ip,p,BetheBloch(p,mass));
 }
 g->GetXaxis()->SetTitle("Momentum (GeV/c)");
 g->GetYaxis()->SetTitle("dE/dx (keV/300 #mum)");
 return g;
}
Commit	Line	Data
75c74fab	1	/**************************************************************************
	2	* Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	///////////////////////////////////////////////////////////////////
	19	// //
	20	// Implementation of the base class for dEdx analysis //
	21	// Origin: F.Prino, Torino, prino@to.infn.it //
	22	// //
	23	///////////////////////////////////////////////////////////////////
	24
	25	#include <TString.h>
	26	#include <TFile.h>
	27	#include <TParticlePDG.h>
	28	#include <TDatabasePDG.h>
	29	#include "AliITSdEdxAnalyzer.h"
	30	#include "AliExternalTrackParam.h"
	31	#include "AliITSpidESD.h"
	32	#include "AliPID.h"
	33
	34	ClassImp(AliITSdEdxAnalyzer)
	35
	36	const Int_t AliITSdEdxAnalyzer::fgkPdgCode[kNParticles]={211,321,2212};
	37	const Int_t AliITSdEdxAnalyzer::fgkLayerCode[kNValuesdEdx]={3,4,5,6,0};
	38
	39	//______________________________________________________________________
	40	AliITSdEdxAnalyzer::AliITSdEdxAnalyzer() :
	41	TObject(),
	42	fNPBins(10),
	43	fPMin(0.1),
	44	fPMax(1.1),
	45	fHistodEdx(0),
	46	fHistoDeltadEdx(0),
	47	fHistodEdxVsP(0),
	48	fThickness(0.03),
	49	fDensity(2.33),
	50	fBBmodel(0),
	51	fMIP(82.),
	52	fTPCpidCut(0.5)
	53	{
	54	// default constructor
	55	BookHistos();
	56	}
	57	//______________________________________________________________________
	58	AliITSdEdxAnalyzer::AliITSdEdxAnalyzer(const Int_t npbins, const Float_t pmin, const Float_t pmax) :
	59	TObject(),
	60	fNPBins(npbins),
	61	fPMin(pmin),
	62	fPMax(pmax),
	63	fHistodEdx(0),
	64	fHistoDeltadEdx(0),
65	fHistodEdxVsP(0),
66	fThickness(0.03),
67	fDensity(2.33),
68	fBBmodel(0),
69	fMIP(82.),
70	fTPCpidCut(0.5)
71	{
72	// standard constructor
73	BookHistos();
74	}
75	//______________________________________________________________________
76	AliITSdEdxAnalyzer::~AliITSdEdxAnalyzer(){
77	// destructor
78	DeleteHistos();
79	}
80	//______________________________________________________________________
81	void AliITSdEdxAnalyzer::SetMomentumBins(const Int_t npbins, const Float_t pmin, const Float_t pmax){
82	// Kill exisiting histos, set new binning, book new histos
83	DeleteHistos();
84	fNPBins=npbins;
85	fPMin=pmin;
86	fPMax=pmax;
87	BookHistos();
88	}
89	//______________________________________________________________________
90	void AliITSdEdxAnalyzer::DeleteHistos(){
91	//
92	if(fHistodEdx){
93	for(Int_t i=0; i<GetNHistos();i++) delete fHistodEdx[i];
94	delete [] fHistodEdx;
95	fHistodEdx=0;
96	}
97	if(fHistoDeltadEdx){
98	for(Int_t i=0; i<GetNHistos();i++) delete fHistoDeltadEdx[i];
99	delete [] fHistoDeltadEdx;
100	fHistoDeltadEdx=0;
101	}
102	if(fHistodEdxVsP){
103	for(Int_t i=0; i<GetNHistos2();i++) delete fHistodEdxVsP[i];
104	delete [] fHistodEdxVsP;
105	fHistodEdxVsP=0;
106	}
107	}
108	//______________________________________________________________________
109	void AliITSdEdxAnalyzer::BookHistos(){
110	//
111	fHistodEdx=new TH1F*[GetNHistos()];
112	fHistoDeltadEdx=new TH1F*[GetNHistos()];
113	for(Int_t iSpecie=0; iSpecie<kNParticles; iSpecie++){
114	for(Int_t iPBin=0; iPBin<fNPBins; iPBin++){
115	for(Int_t iVal=0; iVal<kNValuesdEdx; iVal++){
116	TString hisnam1=Form("hdEdx%dpbin%dpart%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
117	TString histit1=Form("dEdx layer %d (keV) pbin%d part%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
118	if(iVal==kNValuesdEdx-1) histit1=Form("dEdx trunc. mean (keV) pbin%d part%d",iPBin,fgkPdgCode[iSpecie]);
119	fHistodEdx[GetIndex(iSpecie,iPBin,iVal)]=new TH1F(hisnam1.Data(),histit1.Data(),100,0.,500.);
120	fHistodEdx[GetIndex(iSpecie,iPBin,iVal)]->GetXaxis()->SetTitle(histit1.Data());
121	TString hisnam2=Form("hdeltadEdx%dpbin%dpart%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
122	TString histit2=Form("(dEdx_l%d-BetheBloch)/BetheBloch pbin%d part%d",fgkLayerCode[iVal],iPBin,fgkPdgCode[iSpecie]);
123	if(iVal==kNValuesdEdx-1) histit1=Form("(dEdx_truncmean-BetheBloch)/BetheBloch pbin%d part%d",iPBin,fgkPdgCode[iSpecie]);
124	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,iVal)]=new TH1F(hisnam2.Data(),histit2.Data(),100,-0.5,0.5);
125	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,iVal)]->GetXaxis()->SetTitle(histit2.Data());
126	}
127	}
128	}
129
130	fHistodEdxVsP=new TH2F*[GetNHistos2()];
131	for(Int_t iSpecie=0; iSpecie<kNParticles; iSpecie++){
132	for(Int_t iVal=0; iVal<kNValuesdEdx; iVal++){
133	TString hisnam=Form("hdEdx%dVsPpart%d",fgkLayerCode[iVal],fgkPdgCode[iSpecie]);
134	TString histit=Form("dEdx layer %d (keV) vs P part%d",fgkLayerCode[iVal],fgkPdgCode[iSpecie]);
135	if(iVal==kNValuesdEdx-1) histit=Form("dEdx trunc. mean (keV) vs P part%d",fgkPdgCode[iSpecie]);
136	fHistodEdxVsP[GetIndex2(iSpecie,iVal)]=new TH2F(hisnam.Data(),histit.Data(),50,fPMin,fPMax,50,0.,500.);
137	histit.ReplaceAll(" vs P "," ");
138	fHistodEdxVsP[GetIndex2(iSpecie,iVal)]->GetYaxis()->SetTitle(histit.Data());
139	fHistodEdxVsP[GetIndex2(iSpecie,iVal)]->GetXaxis()->SetTitle("Momentum (GeV/c)");
140	}
141	}
142	}
143	//______________________________________________________________________
144	void AliITSdEdxAnalyzer:: WriteHistos(TString filename) const {
145	TFile *outfile=new TFile(filename.Data(),"recreate");
146	outfile->cd();
147	for(Int_t i=0; i<GetNHistos();i++){
148	fHistodEdx[i]->Write();
149	fHistoDeltadEdx[i]->Write();
150	}
151	for(Int_t i=0; i<GetNHistos2();i++) fHistodEdxVsP[i]->Write();
152	outfile->Close();
153	delete outfile;
154	}
155	//______________________________________________________________________
156	void AliITSdEdxAnalyzer::ReadEvent(AliESDEvent* esd, AliStack* stack){
157	// Fill histos
158	// if stack is !=0 MC truth is used to define particle specie
159	// else TPC pid is used to define particle specie
160
161	if(!esd) AliFatal("Bad ESD event");
162	for (Int_t iTrack = 0; iTrack < esd->GetNumberOfTracks(); iTrack++) {
163	AliESDtrack* track = esd->GetTrack(iTrack);
164	Double_t trmean=track->GetITSsignal();
165	Double_t sig[4];
166	track->GetITSdEdxSamples(sig);
167	Double_t preco=track->P();
168	Int_t iPBin=GetMomentumBin(preco);
169	if(iPBin==-1) continue;
170	Int_t iSpecie=-1;
171	Double_t dedxbb=0;
172	if(stack){
173	Int_t lab=track->GetLabel();
174	if(lab<0) continue;
175	TParticle* part=(TParticle*)stack->Particle(lab);
176	Int_t absPdgCode=TMath::Abs(part->GetPdgCode());
177	iSpecie=GetSpecieBin(absPdgCode);
178	if(iSpecie==-1) continue;
179	dedxbb=BetheBloch(part);
180	}else{
181	iSpecie=GetPaticleIdFromTPC(track);
182	if(iSpecie==-1) continue;
183	TParticlePDG* p=TDatabasePDG::Instance()->GetParticle(fgkPdgCode[iSpecie]);
184	dedxbb=BetheBloch(preco,p->Mass());
185	}
186	for(Int_t ilay=0;ilay<4;ilay++){
187	if(sig[ilay]>0.){
188	fHistodEdx[GetIndex(iSpecie,iPBin,ilay)]->Fill(sig[ilay]);
189	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,ilay)]->Fill((sig[ilay]-dedxbb)/dedxbb);
190	fHistodEdxVsP[GetIndex2(iSpecie,ilay)]->Fill(preco,sig[ilay]);
191	}
192	}
193	if(trmean>0.){
194	fHistodEdx[GetIndex(iSpecie,iPBin,4)]->Fill(trmean);
195	fHistoDeltadEdx[GetIndex(iSpecie,iPBin,4)]->Fill((trmean-dedxbb)/dedxbb);
196	fHistodEdxVsP[GetIndex2(iSpecie,4)]->Fill(preco,trmean);
197	}
198	}
199	}
200	//______________________________________________________________________
201	Int_t AliITSdEdxAnalyzer::GetPaticleIdFromTPC(const AliESDtrack* track) const {
202	//
203	Double_t tpcpid[AliPID::kSPECIES];
204	track->GetTPCpid(tpcpid);
205	Int_t maxPos=-1;
206	Float_t maxProb=0.;
207	for(Int_t is=0; is<AliPID::kSPECIES; is++){
208	if(tpcpid[is]>maxProb){
209	maxProb=tpcpid[is];
210	maxPos=is;
211	}
212	}
213	Int_t iSpecie=-1;
214	if(maxProb>fTPCpidCut){
215	if(maxPos==AliPID::kPion) iSpecie=0;
216	else if(maxPos==AliPID::kKaon) iSpecie=1;
217	else if(maxPos==AliPID::kProton) iSpecie=2;
218	}
219	return iSpecie;
220	}
221	//______________________________________________________________________
222	Double_t AliITSdEdxAnalyzer::BetheBloch(const Float_t p, const Float_t m) const {
223	//
224	Double_t dedxbb=0.;
26964b7f	225	if(fBBmodel==0){
75c74fab	226	Double_t betagamma=p/m;
b89be497	227	Double_t conv=fDensity1E6fThickness/116.24*fMIP;
75c74fab	228	dedxbb=conv*AliExternalTrackParam::BetheBlochSolid(betagamma);
26964b7f	229	}else if(fBBmodel==1){
75c74fab	230	dedxbb=fMIP*AliITSpidESD::Bethe(p,m);
75c74fab	231	}
	232	return dedxbb;
	233	}
	234	//______________________________________________________________________
	235	TGraph* AliITSdEdxAnalyzer::GetBetheBlochGraph(const Int_t pdgcode) const {
b246a937	236	// Fills a TGraph with Bethe-Bloch expe
	237	TGraph* g=new TGraph(0);
	238	TParticlePDG* part=TDatabasePDG::Instance()->GetParticle(pdgcode);
	239	Float_t mass=part->Mass();
	240	for(Int_t ip=0; ip<100;ip++){
	241	Float_t p=fPMin+(ip+0.5)*(fPMax-fPMin)/100.;
	242	g->SetPoint(ip,p,BetheBloch(p,mass));
	243	}
	244	g->GetXaxis()->SetTitle("Momentum (GeV/c)");
	245	g->GetYaxis()->SetTitle("dE/dx (keV/300 #mum)");
	246	return g;
75c74fab	247	}