void createSpaceCharge(TString fileList, unsigned int nEvents=0) 
{
  
  Int_t iVerbose = 1;
  TString primFile;

  // -----   Digitization run   -------------------------------------------
  FairRunAna *fRun= new FairRunAna();
  // ------------------------------------------------------------------------

  
  //use python do parse filelist 
  TPython::LoadMacro("macro/tpc/FOPI/parseFiles.py");
  PyFileParser fp;
  fp.setFiles(fileList.Data());
  int nFiles = (int)fp.getNum();
  for(int i=0; i<nFiles; i++) {
    if(i==0){
      fRun->SetInputFile((char*)fp.getFile(i));
      primFile = TString((char*)fp.getFile(i));
    }
    else
      fRun->AddFile((char*)fp.getFile(i));
  }

  
  TString outFile = primFile;
  outFile.ReplaceAll("mc.root", "raw.root");

  fRun->SetOutputFile(outFile);

  TString paramIn = primFile;
  paramIn.ReplaceAll(".mc.root",".param.root");
  TString paramOut = outFile;
  paramOut.ReplaceAll(".raw.root",".param.digi.root");

  
  std::cout<<"Input: "<<primFile<<std::endl;
  std::cout<<"Output: "<<outFile<<std::endl;
  std::cout<<"ParamIn: "<<paramIn<<std::endl;
  std::cout<<"ParamOut: "<<paramOut<<std::endl;
  


  // In general, the following parts need not be touched
  // ========================================================================



  // -----   Timer   --------------------------------------------------------
  TStopwatch timer;
  timer.Start();
  // ------------------------------------------------------------------------

  // ------ QAplots
  QAPlotCollection* qa=new QAPlotCollection("TpcDigiQAPlots");

  // -----  Parameter database   --------------------------------------------
  FairRuntimeDb* rtdb = fRun->GetRuntimeDb();
  FairParRootFileIo* parInput1 = new FairParRootFileIo(kTRUE);
  parInput1->open(paramIn.Data());
  FairParAsciiFileIo* parInput2 = new FairParAsciiFileIo();
  TString tpcDigiFile = gSystem->Getenv("VMCWORKDIR");
  tpcDigiFile += "/tpc/parfiles/tpc_edged.par";
  parInput2->open(tpcDigiFile.Data(),"in");

  rtdb->setFirstInput(parInput2);
  rtdb->setSecondInput(parInput1);

  TpcDigiPar* par = (TpcDigiPar*) rtdb->getContainer("TpcDigiPar");
  par->setInputVersion(fRun->GetRunId(),1);
  par->setChanged(kTRUE);

  FairParRootFileIo* parOutput1 = new FairParRootFileIo(kTRUE);
  parOutput1->open(paramOut.Data());
  rtdb->setOutput(parOutput1);
  rtdb->saveOutput();

  //fRun->LoadGeometry();
  // ------------------------------------------------------------------------

  // -----    Digi Sequence  --------------------------------------------

  TpcClusterizerTask* cl = new TpcClusterizerTask();
  cl->SetMereChargeConversion();
  cl->SetPersistence();
  fRun->AddTask(cl);

  TpcSpaceChargeTask* tpcSP = new TpcSpaceChargeTask();
  tpcSP->SetAliceMode(kTRUE);
  tpcSP->SetBins(26,149);
  tpcSP->SetPrimClBranchName("TpcPrimaryCluster");
  fRun->AddTask(tpcSP);   
  
  // -----   Intialise and run   --------------------------------------------
  fRun->Init();
  rtdb->print();
  
  fRun->Run(0,nEvents); // process all events from input file
  // ------------------------------------------------------------------------


//tpcDrifter->WriteHistograms();
//tpcPadResponse->WriteHistograms();
//tpcElec->WriteHistograms();

  FairRootManager::Instance()->GetOutFile()->mkdir("QAPlots");
  FairRootManager::Instance()->GetOutFile()->cd("QAPlots");
  qa->Write();
 
  TString SCfile = outFile;
  SCfile.ReplaceAll("raw.root", "SC_smallsteps.dat");
  tpcSP->writeToFile(SCfile.Data());
 
  // -----   Finish   -------------------------------------------------------


  //delete tpcSplitter;

  rtdb->saveOutput();
  rtdb->print();


  timer.Stop();
  Double_t rtime = timer.RealTime();
  Double_t ctime = timer.CpuTime();
  cout << endl << endl;
  cout << "Macro finished succesfully." << endl;
  cout << "Output file is "    << outFile << endl;
  cout << "Parameter file is " << paramOut << endl;
  cout << "Real time " << rtime << " s, CPU time " << ctime << " s" << endl;
  cout << endl;
  // ------------------------------------------------------------------------


}