[u/mrichter/AliRoot.git] / PWG0 / dNdEta / AlidNdEtaSystematicsSelector.cxx

/* $Id$ */

#include "AlidNdEtaSystematicsSelector.h"

#include <TStyle.h>
#include <TSystem.h>
#include <TCanvas.h>
#include <TVector3.h>
#include <TChain.h>
#include <TFile.h>
#include <TH3F.h>
#include <TH1F.h>
#include <TParticle.h>

#include <AliLog.h>
#include <AliESD.h>
#include <AliGenEventHeader.h>
#include <AliStack.h>
#include <AliHeader.h>

#include "esdTrackCuts/AliESDtrackCuts.h"
#include "AliPWG0Helper.h"
#include "AlidNdEtaCorrection.h"

ClassImp(AlidNdEtaSystematicsSelector)

AlidNdEtaSystematicsSelector::AlidNdEtaSystematicsSelector() :
  AliSelectorRL(),
  fSecondaries(0),
  fEsdTrackCuts(0)
{
  //
  // Constructor. Initialization of pointers
  //

  for (Int_t i=0; i<4; ++i)
    fdNdEtaCorrection[i] = 0;
}

AlidNdEtaSystematicsSelector::~AlidNdEtaSystematicsSelector()
{
  //
  // Destructor
  //
}

void AlidNdEtaSystematicsSelector::Begin(TTree* tree)
{
  // Begin function

  AliSelectorRL::Begin(tree);

  ReadUserObjects(tree);
}

void AlidNdEtaSystematicsSelector::ReadUserObjects(TTree* tree)
{
  // read the user objects, called from slavebegin and begin

  if (!fEsdTrackCuts && fInput)
    fEsdTrackCuts = dynamic_cast<AliESDtrackCuts*> (fInput->FindObject("AliESDtrackCuts"));

  if (!fEsdTrackCuts && tree)
    fEsdTrackCuts = dynamic_cast<AliESDtrackCuts*> (tree->GetUserInfo()->FindObject("AliESDtrackCuts"));

  if (!fEsdTrackCuts)
     AliDebug(AliLog::kError, "ERROR: Could not read EsdTrackCuts from input list.");
}

void AlidNdEtaSystematicsSelector::SlaveBegin(TTree* tree)
{
  // The SlaveBegin() function is called after the Begin() function.
  // When running with PROOF SlaveBegin() is called on each slave server.
  // The tree argument is deprecated (on PROOF 0 is passed).

  AliSelector::SlaveBegin(tree);

  ReadUserObjects(tree);

  TString option(GetOption());

  printf("Running AlidNdEtaSystematicsSelector with options %s\n", option.Data());

  if (option.Contains("secondaries"))
  {
    fSecondaries = new TH3F("fSecondaries", "fSecondaries;NacceptedTracks;CratioSecondaries;p_{T}", 201, -0.5, 205.5, 16, 0.45, 2.05, 10, 0, 10);
  }

  if (option.Contains("particle-composition"))
  {
    for (Int_t i=0; i<4; ++i)
    {
      TString name;
      name.Form("correction_%d", i);
      fdNdEtaCorrection[i] = new AlidNdEtaCorrection(name, name);
    }
  }
}

Bool_t AlidNdEtaSystematicsSelector::Process(Long64_t entry)
{
  // The Process() function is called for each entry in the tree (or possibly
  // keyed object in the case of PROOF) to be processed. The entry argument
  // specifies which entry in the currently loaded tree is to be processed.
  // It can be passed to either TTree::GetEntry() or TBranch::GetEntry()
  // to read either all or the required parts of the data. When processing
  // keyed objects with PROOF, the object is already loaded and is available
  // via the fObject pointer.
  //
  // This function should contain the "body" of the analysis. It can contain
  // simple or elaborate selection criteria, run algorithms on the data
  // of the event and typically fill histograms.

  // WARNING when a selector is used with a TChain, you must use
  //  the pointer to the current TTree to call GetEntry(entry).
  //  The entry is always the local entry number in the current tree.
  //  Assuming that fTree is the pointer to the TChain being processed,
  //  use fTree->GetTree()->GetEntry(entry).

  if (AliSelectorRL::Process(entry) == kFALSE)
    return kFALSE;

  // Check prerequisites
  if (!fESD)
  {
    AliDebug(AliLog::kError, "ESD branch not available");
    return kFALSE;
  }

  if (!fEsdTrackCuts)
  {
    AliDebug(AliLog::kError, "fESDTrackCuts not available");
    return kFALSE;
  }

  AliStack* stack = GetStack();
  if (!stack)
  {
    AliDebug(AliLog::kError, "Stack not available");
    return kFALSE;
  }

  TObjArray* list = fEsdTrackCuts->GetAcceptedTracks(fESD);

  if (fdNdEtaCorrection[0])
    FillCorrectionMaps(list);

  if (fSecondaries)
    FillSecondaries(list);

  delete list;
  list = 0;

  return kTRUE;
}

void AlidNdEtaSystematicsSelector::FillCorrectionMaps(TObjArray* listOfTracks)
{
  // fills the correction maps for different particle species

  AliStack* stack = GetStack();
  AliHeader* header = GetHeader();

  Bool_t vertexReconstructed = AliPWG0Helper::IsVertexReconstructed(fESD);
  Bool_t eventTriggered = AliPWG0Helper::IsEventTriggered(fESD);

  for (Int_t i=0; i<4; ++i)
  {
    fdNdEtaCorrection[i]->IncreaseEventCount();
    if (eventTriggered)
      fdNdEtaCorrection[i]->IncreaseTriggeredEventCount();
  }

  // get the MC vertex
  AliGenEventHeader* genHeader = header->GenEventHeader();

  TArrayF vtxMC(3);
  genHeader->PrimaryVertex(vtxMC);

  // loop over mc particles
  Int_t nPrim  = stack->GetNprimary();

  for (Int_t iMc = 0; iMc < nPrim; ++iMc)
  {
    TParticle* particle = stack->Particle(iMc);

    if (!particle)
    {
      AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (mc loop).", iMc));
      continue;
    }

    if (AliPWG0Helper::IsPrimaryCharged(particle, nPrim) == kFALSE)
      continue;

    Float_t eta = particle->Eta();
    Float_t pt = particle->Pt();

    Int_t id = -1;
    switch (TMath::Abs(particle->GetPdgCode()))
    {
      case 211: id = 0; break;
      case 321: id = 1; break;
      case 2212: id = 2; break;
      default: id = 3; break;
    }

    if (vertexReconstructed)
      fdNdEtaCorrection[id]->FillParticle(vtxMC[2], eta, pt);

    fdNdEtaCorrection[id]->FillParticleAllEvents(eta, pt);
    if (eventTriggered)
      fdNdEtaCorrection[id]->FillParticleWhenEventTriggered(eta, pt);
  }// end of mc particle

  // loop over esd tracks
  TIterator* iter = listOfTracks->MakeIterator();
  TObject* obj = 0;
  while ((obj = iter->Next()) != 0)
  {
    AliESDtrack* esdTrack = dynamic_cast<AliESDtrack*> (obj);
    if (!esdTrack)
      continue;

    // using the properties of the mc particle
    Int_t label = TMath::Abs(esdTrack->GetLabel());
    if (label == 0)
    {
      AliDebug(AliLog::kWarning, Form("WARNING: cannot find corresponding mc part for track %d.", label));
      continue;
    }

    TParticle* particle = stack->Particle(label);
    if (!particle)
    {
      AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (track loop).", label));
      continue;
    }

    Int_t id = -1;
    switch (TMath::Abs(particle->GetPdgCode()))
    {
      case 211: id = 0; break;
      case 321: id = 1; break;
      case 2212: id = 2; break;
      default: id = 3; break;
    }

    if (vertexReconstructed)
      fdNdEtaCorrection[id]->FillParticleWhenMeasuredTrack(vtxMC[2], particle->Eta(), particle->Pt());
  } // end of track loop

  delete iter;
  iter = 0;
}

void AlidNdEtaSystematicsSelector::FillSecondaries(TObjArray* listOfTracks)
{
  // fills the secondary histograms

  AliStack* stack = GetStack();

  TH1* nPrimaries = new TH1F("secondaries_primaries", "secondaries_primaries", fSecondaries->GetZaxis()->GetNbins(), fSecondaries->GetZaxis()->GetXmin(), fSecondaries->GetZaxis()->GetXmax());
  TH1* nSecondaries = new TH1F("secondaries_secondaries", "secondaries_secondaries", fSecondaries->GetZaxis()->GetNbins(), fSecondaries->GetZaxis()->GetXmin(), fSecondaries->GetZaxis()->GetXmax());

  TIterator* iter = listOfTracks->MakeIterator();
  TObject* obj = 0;
  while ((obj = iter->Next()) != 0)
  {
    AliESDtrack* esdTrack = dynamic_cast<AliESDtrack*> (obj);
    if (!esdTrack)
      continue;

    Int_t label = TMath::Abs(esdTrack->GetLabel());
    if (label == 0)
    {
      AliDebug(AliLog::kWarning, Form("WARNING: cannot find corresponding mc part for track %d.", label));
      continue;
    }

    TParticle* particle = stack->Particle(label);
    if (!particle)
    {
      AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (track loop).", label));
      continue;
    }

    Int_t nPrim  = stack->GetNprimary();
    if (label < nPrim)
      nPrimaries->Fill(particle->Pt());
    else
      nSecondaries->Fill(particle->Pt());
  }

  for (Int_t i=1; i<=nPrimaries->GetNbinsX(); ++i)
  {
    Int_t primaries = (Int_t) nPrimaries->GetBinContent(i);
    Int_t secondaries = (Int_t) nSecondaries->GetBinContent(i);

    if (primaries + secondaries > 0)
    {
      AliDebug(AliLog::kDebug, Form("The ratio between primaries and secondaries is %d:%d = %f", primaries, secondaries, ((secondaries > 0) ? (Double_t) primaries / secondaries : -1)));

      for (Double_t factor = 0.5; factor < 2.01; factor += 0.1)
        fSecondaries->Fill((Double_t) primaries + (Double_t) secondaries * factor, factor, nPrimaries->GetBinCenter(i));
    }
  }

  delete nPrimaries;
  nPrimaries = 0;

  delete nSecondaries;
  nSecondaries = 0;

  delete iter;
  iter = 0;
}

void AlidNdEtaSystematicsSelector::SlaveTerminate()
{
  // The SlaveTerminate() function is called after all entries or objects
  // have been processed. When running with PROOF SlaveTerminate() is called
  // on each slave server.

  AliSelector::SlaveTerminate();

  // Add the histograms to the output on each slave server
  if (!fOutput)
  {
    AliDebug(AliLog::kError, Form("ERROR: Output list not initialized."));
    return;
  }

  if (fSecondaries)
    fOutput->Add(fSecondaries);

  for (Int_t i=0; i<4; ++i)
    if (fdNdEtaCorrection[i])
      fOutput->Add(fdNdEtaCorrection[i]);
}

void AlidNdEtaSystematicsSelector::Terminate()
{
  // The Terminate() function is the last function to be called during
  // a query. It always runs on the client, it can be used to present
  // the results graphically or save the results to file.

  AliSelector::Terminate();

  fSecondaries = dynamic_cast<TH3F*> (fOutput->FindObject("fSecondaries"));
  for (Int_t i=0; i<4; ++i)
    fdNdEtaCorrection[i] = dynamic_cast<AlidNdEtaCorrection*> (fOutput->FindObject(Form("correction_%d", i)));

  TFile* fout = TFile::Open("systematics.root", "RECREATE");

  if (fEsdTrackCuts)
    fEsdTrackCuts->SaveHistograms("esd_track_cuts");

  if (fSecondaries)
    fSecondaries->Write();

  for (Int_t i=0; i<4; ++i)
    if (fdNdEtaCorrection[i])
      fdNdEtaCorrection[i]->SaveHistograms();

  fout->Write();
  fout->Close();

  if (fSecondaries)
  {
    new TCanvas;
    fSecondaries->Draw();
  }
}
Commit	Line	Data
10ebe68d	1	/* $Id$ */
	2
	3	#include "AlidNdEtaSystematicsSelector.h"
	4
	5	#include <TStyle.h>
	6	#include <TSystem.h>
	7	#include <TCanvas.h>
	8	#include <TVector3.h>
	9	#include <TChain.h>
	10	#include <TFile.h>
	11	#include <TH3F.h>
	12	#include <TH1F.h>
	13	#include <TParticle.h>
	14
	15	#include <AliLog.h>
	16	#include <AliESD.h>
	17	#include <AliGenEventHeader.h>
	18	#include <AliStack.h>
	19	#include <AliHeader.h>
	20
	21	#include "esdTrackCuts/AliESDtrackCuts.h"
	22	#include "AliPWG0Helper.h"
	23	#include "AlidNdEtaCorrection.h"
	24
	25	ClassImp(AlidNdEtaSystematicsSelector)
	26
	27	AlidNdEtaSystematicsSelector::AlidNdEtaSystematicsSelector() :
	28	AliSelectorRL(),
	29	fSecondaries(0),
	30	fEsdTrackCuts(0)
	31	{
	32	//
	33	// Constructor. Initialization of pointers
	34	//
	35
	36	for (Int_t i=0; i<4; ++i)
	37	fdNdEtaCorrection[i] = 0;
	38	}
	39
	40	AlidNdEtaSystematicsSelector::~AlidNdEtaSystematicsSelector()
	41	{
	42	//
	43	// Destructor
	44	//
	45	}
	46
	47	void AlidNdEtaSystematicsSelector::Begin(TTree* tree)
	48	{
	49	// Begin function
	50
	51	AliSelectorRL::Begin(tree);
	52
	53	ReadUserObjects(tree);
	54	}
	55
	56	void AlidNdEtaSystematicsSelector::ReadUserObjects(TTree* tree)
	57	{
	58	// read the user objects, called from slavebegin and begin
	59
	60	if (!fEsdTrackCuts && fInput)
	61	fEsdTrackCuts = dynamic_cast<AliESDtrackCuts*> (fInput->FindObject("AliESDtrackCuts"));
	62
	63	if (!fEsdTrackCuts && tree)
	64	fEsdTrackCuts = dynamic_cast<AliESDtrackCuts*> (tree->GetUserInfo()->FindObject("AliESDtrackCuts"));
65
66	if (!fEsdTrackCuts)
67	AliDebug(AliLog::kError, "ERROR: Could not read EsdTrackCuts from input list.");
68	}
69
70	void AlidNdEtaSystematicsSelector::SlaveBegin(TTree* tree)
71	{
72	// The SlaveBegin() function is called after the Begin() function.
73	// When running with PROOF SlaveBegin() is called on each slave server.
74	// The tree argument is deprecated (on PROOF 0 is passed).
75
76	AliSelector::SlaveBegin(tree);
77
78	ReadUserObjects(tree);
79
80	TString option(GetOption());
81
82	printf("Running AlidNdEtaSystematicsSelector with options %s\n", option.Data());
83
84	if (option.Contains("secondaries"))
85	{
86	fSecondaries = new TH3F("fSecondaries", "fSecondaries;NacceptedTracks;CratioSecondaries;p_{T}", 201, -0.5, 205.5, 16, 0.45, 2.05, 10, 0, 10);
87	}
88
89	if (option.Contains("particle-composition"))
90	{
91	for (Int_t i=0; i<4; ++i)
92	{
93	TString name;
94	name.Form("correction_%d", i);
95	fdNdEtaCorrection[i] = new AlidNdEtaCorrection(name, name);
96	}
97	}
98	}
99
100	Bool_t AlidNdEtaSystematicsSelector::Process(Long64_t entry)
101	{
102	// The Process() function is called for each entry in the tree (or possibly
103	// keyed object in the case of PROOF) to be processed. The entry argument
104	// specifies which entry in the currently loaded tree is to be processed.
105	// It can be passed to either TTree::GetEntry() or TBranch::GetEntry()
106	// to read either all or the required parts of the data. When processing
107	// keyed objects with PROOF, the object is already loaded and is available
108	// via the fObject pointer.
109	//
110	// This function should contain the "body" of the analysis. It can contain
111	// simple or elaborate selection criteria, run algorithms on the data
112	// of the event and typically fill histograms.
113
114	// WARNING when a selector is used with a TChain, you must use
115	// the pointer to the current TTree to call GetEntry(entry).
116	// The entry is always the local entry number in the current tree.
117	// Assuming that fTree is the pointer to the TChain being processed,
118	// use fTree->GetTree()->GetEntry(entry).
119
120	if (AliSelectorRL::Process(entry) == kFALSE)
121	return kFALSE;
122
123	// Check prerequisites
124	if (!fESD)
125	{
126	AliDebug(AliLog::kError, "ESD branch not available");
127	return kFALSE;
128	}
129
130	if (!fEsdTrackCuts)
131	{
132	AliDebug(AliLog::kError, "fESDTrackCuts not available");
133	return kFALSE;
134	}
135
136	AliStack* stack = GetStack();
137	if (!stack)
138	{
139	AliDebug(AliLog::kError, "Stack not available");
140	return kFALSE;
141	}
142
143	TObjArray* list = fEsdTrackCuts->GetAcceptedTracks(fESD);
144
145	if (fdNdEtaCorrection[0])
146	FillCorrectionMaps(list);
147
148	if (fSecondaries)
149	FillSecondaries(list);
150
151	delete list;
152	list = 0;
153
154	return kTRUE;
155	}
156
157	void AlidNdEtaSystematicsSelector::FillCorrectionMaps(TObjArray* listOfTracks)
158	{
159	// fills the correction maps for different particle species
160
161	AliStack* stack = GetStack();
162	AliHeader* header = GetHeader();
163
164	Bool_t vertexReconstructed = AliPWG0Helper::IsVertexReconstructed(fESD);
165	Bool_t eventTriggered = AliPWG0Helper::IsEventTriggered(fESD);
166
167	for (Int_t i=0; i<4; ++i)
168	{
169	fdNdEtaCorrection[i]->IncreaseEventCount();
170	if (eventTriggered)
171	fdNdEtaCorrection[i]->IncreaseTriggeredEventCount();
172	}
173
174	// get the MC vertex
175	AliGenEventHeader* genHeader = header->GenEventHeader();
176
177	TArrayF vtxMC(3);
178	genHeader->PrimaryVertex(vtxMC);
179
180	// loop over mc particles
181	Int_t nPrim = stack->GetNprimary();
182
183	for (Int_t iMc = 0; iMc < nPrim; ++iMc)
184	{
185	TParticle* particle = stack->Particle(iMc);
186
187	if (!particle)
188	{
189	AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (mc loop).", iMc));
190	continue;
191	}
192
193	if (AliPWG0Helper::IsPrimaryCharged(particle, nPrim) == kFALSE)
194	continue;
195
196	Float_t eta = particle->Eta();
197	Float_t pt = particle->Pt();
198
199	Int_t id = -1;
200	switch (TMath::Abs(particle->GetPdgCode()))
201	{
202	case 211: id = 0; break;
203	case 321: id = 1; break;
204	case 2212: id = 2; break;
205	default: id = 3; break;
206	}
207
208	if (vertexReconstructed)
209	fdNdEtaCorrection[id]->FillParticle(vtxMC[2], eta, pt);
210
211	fdNdEtaCorrection[id]->FillParticleAllEvents(eta, pt);
212	if (eventTriggered)
213	fdNdEtaCorrection[id]->FillParticleWhenEventTriggered(eta, pt);
214	}// end of mc particle
215
216	// loop over esd tracks
217	TIterator* iter = listOfTracks->MakeIterator();
218	TObject* obj = 0;
219	while ((obj = iter->Next()) != 0)
220	{
221	AliESDtrack* esdTrack = dynamic_cast<AliESDtrack*> (obj);
222	if (!esdTrack)
223	continue;
224
225	// using the properties of the mc particle
226	Int_t label = TMath::Abs(esdTrack->GetLabel());
227	if (label == 0)
228	{
229	AliDebug(AliLog::kWarning, Form("WARNING: cannot find corresponding mc part for track %d.", label));
230	continue;
231	}
232
233	TParticle* particle = stack->Particle(label);
234	if (!particle)
235	{
236	AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (track loop).", label));
237	continue;
238	}
239
240	Int_t id = -1;
241	switch (TMath::Abs(particle->GetPdgCode()))
242	{
243	case 211: id = 0; break;
244	case 321: id = 1; break;
245	case 2212: id = 2; break;
246	default: id = 3; break;
247	}
248
249	if (vertexReconstructed)
250	fdNdEtaCorrection[id]->FillParticleWhenMeasuredTrack(vtxMC[2], particle->Eta(), particle->Pt());
251	} // end of track loop
252
253	delete iter;
254	iter = 0;
255	}
256
257	void AlidNdEtaSystematicsSelector::FillSecondaries(TObjArray* listOfTracks)
258	{
259	// fills the secondary histograms
260
261	AliStack* stack = GetStack();
262
263	TH1* nPrimaries = new TH1F("secondaries_primaries", "secondaries_primaries", fSecondaries->GetZaxis()->GetNbins(), fSecondaries->GetZaxis()->GetXmin(), fSecondaries->GetZaxis()->GetXmax());
264	TH1* nSecondaries = new TH1F("secondaries_secondaries", "secondaries_secondaries", fSecondaries->GetZaxis()->GetNbins(), fSecondaries->GetZaxis()->GetXmin(), fSecondaries->GetZaxis()->GetXmax());
265
266	TIterator* iter = listOfTracks->MakeIterator();
267	TObject* obj = 0;
268	while ((obj = iter->Next()) != 0)
269	{
270	AliESDtrack* esdTrack = dynamic_cast<AliESDtrack*> (obj);
271	if (!esdTrack)
272	continue;
273
274	Int_t label = TMath::Abs(esdTrack->GetLabel());
275	if (label == 0)
276	{
277	AliDebug(AliLog::kWarning, Form("WARNING: cannot find corresponding mc part for track %d.", label));
278	continue;
279	}
280
281	TParticle* particle = stack->Particle(label);
282	if (!particle)
283	{
284	AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (track loop).", label));
285	continue;
286	}
287
288	Int_t nPrim = stack->GetNprimary();
289	if (label < nPrim)
290	nPrimaries->Fill(particle->Pt());
291	else
292	nSecondaries->Fill(particle->Pt());
293	}
294
295	for (Int_t i=1; i<=nPrimaries->GetNbinsX(); ++i)
296	{
297	Int_t primaries = (Int_t) nPrimaries->GetBinContent(i);
298	Int_t secondaries = (Int_t) nSecondaries->GetBinContent(i);
299
300	if (primaries + secondaries > 0)
301	{
302	AliDebug(AliLog::kDebug, Form("The ratio between primaries and secondaries is %d:%d = %f", primaries, secondaries, ((secondaries > 0) ? (Double_t) primaries / secondaries : -1)));
303
304	for (Double_t factor = 0.5; factor < 2.01; factor += 0.1)
305	fSecondaries->Fill((Double_t) primaries + (Double_t) secondaries * factor, factor, nPrimaries->GetBinCenter(i));
306	}
307	}
308
309	delete nPrimaries;
310	nPrimaries = 0;
311
312	delete nSecondaries;
313	nSecondaries = 0;
314
315	delete iter;
316	iter = 0;
317	}
318
319	void AlidNdEtaSystematicsSelector::SlaveTerminate()
320	{
321	// The SlaveTerminate() function is called after all entries or objects
322	// have been processed. When running with PROOF SlaveTerminate() is called
323	// on each slave server.
324
325	AliSelector::SlaveTerminate();
326
327	// Add the histograms to the output on each slave server
328	if (!fOutput)
329	{
330	AliDebug(AliLog::kError, Form("ERROR: Output list not initialized."));
331	return;
332	}
333
334	if (fSecondaries)
335	fOutput->Add(fSecondaries);
336
337	for (Int_t i=0; i<4; ++i)
338	if (fdNdEtaCorrection[i])
339	fOutput->Add(fdNdEtaCorrection[i]);
340	}
341
342	void AlidNdEtaSystematicsSelector::Terminate()
343	{
344	// The Terminate() function is the last function to be called during
345	// a query. It always runs on the client, it can be used to present
346	// the results graphically or save the results to file.
347
348	AliSelector::Terminate();
349
350	fSecondaries = dynamic_cast<TH3F*> (fOutput->FindObject("fSecondaries"));
351	for (Int_t i=0; i<4; ++i)
352	fdNdEtaCorrection[i] = dynamic_cast<AlidNdEtaCorrection*> (fOutput->FindObject(Form("correction_%d", i)));
353
354	TFile* fout = TFile::Open("systematics.root", "RECREATE");
355
356	if (fEsdTrackCuts)
357	fEsdTrackCuts->SaveHistograms("esd_track_cuts");
358
359	if (fSecondaries)
360	fSecondaries->Write();
361
362	for (Int_t i=0; i<4; ++i)
363	if (fdNdEtaCorrection[i])
364	fdNdEtaCorrection[i]->SaveHistograms();
365
366	fout->Write();
367	fout->Close();
368
369	if (fSecondaries)
370	{
371	new TCanvas;
372	fSecondaries->Draw();
373	}
374	}