void runLaserDigi(TString inFile,
		  TString laserGrid="tpc/parfiles/LaserGridJun2012.dat",
		  TString parFile="tpc/parfiles/tpc.par",
		  unsigned int nEvents = 0) {

 

  TString basedir = gSystem->Getenv("VMCWORKDIR");
  TString outFile = inFile;
  outFile.ReplaceAll(".mc.root", ".digi.root");
  TString paramIn = inFile;
  paramIn.ReplaceAll(".mc.root",".param.root");
  TString paramOut = outFile;
  paramOut.ReplaceAll(".digi.root",".param.digi.root");
  

  std::cout<<"Input: "<<inFile<<std::endl;
  std::cout<<"Output: "<<outFile<<std::endl;
  std::cout<<"ParamIn: "<<paramIn<<std::endl;
  std::cout<<"ParamOut: "<<paramOut<<std::endl;
 
  
  // -----   Timer   --------------------------------------------------------
  TStopwatch timer;
  timer.Start();
  // ------------------------------------------------------------------------

  // -----   Digitization run   -------------------------------------------
  FairRunAna *fRun= new FairRunAna();
  fRun->SetInputFile(inFile);
  fRun->SetOutputFile(outFile);
  // ------------------------------------------------------------------------

  // -----  Parameter database   --------------------------------------------
  FairRuntimeDb* rtdb = fRun->GetRuntimeDb();
  FairParRootFileIo* parInput1 = new FairParRootFileIo(kTRUE);
  parInput1->open(paramIn.Data());
  FairParAsciiFileIo* parInput2 = new FairParAsciiFileIo();
  parInput2->open(parFile.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();

  PndGeoHandling* geoH = PndGeoHandling::Instance();

  //fRun->LoadGeometry();
  // ------------------------------------------------------------------------
     
  // -----    Digi Sequence  --------------------------------------------
  TpcClusterizerTask* tpcClusterizer = new TpcClusterizerTask();
  //tpcClusterizer->SetPersistence();
  //ONLY USE THIS WHEN USING ALICE SETTINGS WITH GEANT3
  tpcClusterizer->SetMereChargeConversion();  
  fRun->AddTask(tpcClusterizer);
  /**   Nots for the use of Alice Style MC    
   				make one hit per collision with atom
				use other straggling
		WARNING:	
   	    1. geant3 has to be used!
   	    2. LOSS = 5 has to be set!
	    3. DCUTE und DCUTM should be set to 10 keV.	
	    4. For Digitaization: TpcClusterizerTask
	    		tpcClusterizer->SetMereChargeConversion() has to be set!
	    5. if you do not use this option make sure 2., 4. are not set!
		:-(	
	    6. SetMaxNStep should be set to a high value
  */ 

  TpcLaserTask* laser = new TpcLaserTask();
  laser->SetPersistence(true);
  fRun->AddTask(laser);
 
  TpcDriftTask* tpcDrifter = new TpcDriftTask();
  tpcDrifter->SetPersistence();
  tpcDrifter->SetDistort(true, 1.);
  TString devFile("tpc/parfiles/DevMap_20MeV_plateau_mode1_mom3.672_thMin0.010.dat");
  tpcDrifter->SetDeviationFile(devFile.Data());
  fRun->AddTask(tpcDrifter);

  TpcGemTask* tpcGem = new TpcGemTask();
  //tpcGem->SetPersistence();
  fRun->AddTask(tpcGem);

  TpcPadResponseTask* tpcPadResponse = new TpcPadResponseTask();
  //tpcPadResponse->SetPersistence();
  fRun->AddTask(tpcPadResponse);

  
  TpcElectronicsTask* tpcElec = new TpcElectronicsTask();
  tpcElec->SetPersistence();
  //tpcElec->SetPSATimeCalib(2.8);
  //tpcElec->SetSamplePersistence();
  fRun->AddTask(tpcElec);

  TpcClusterFinderTask* tpcCF = new TpcClusterFinderTask();
  tpcCF->SetPersistence(true);
  tpcCF->timeslice(5); //  in sample times 
  tpcCF->SetClusterTimeCut(4);
  tpcCF->SetErrorPars(600,300);
  tpcCF->SetSimpleClustering();
  //tpcCF->SetSingleDigiClusterAmpCut(15);
  tpcCF->SetClusterBranchName("TpcCluster");
  fRun->AddTask(tpcCF);

  // TpcLaserMatchingTask* lmat = new TpcLaserMatchingTask();
  // lmat->SetPersistence(true);
  // lmat->SetClusterBranchName("TpcCluster");
  // lmat->SetVerboseResiduals(true,false);
  // lmat->SetDistCut(3.);
  // fRun->AddTask(lmat);

  // //the actual calculator:
  // TpcGFTrackResCalc* GFres = new TpcGFTrackResCalc();
  // GFres->addBranchName("TpcGFLaserTrack");
  // //the task:
  // TpcRefTrackResidualTask* res = new TpcRefTrackResidualTask();
  // res->SetResCalculator(GFres);
  // res->SetOutBranch("TpcTrackResiduals");
  // res->SetPersistence();  
  // fRun->AddTask(res);

  // TpcLaserFitTask* lf = new TpcLaserFitTask();
  // lf->SetPlotSplineFits(true);
  // lf->SetPersistence(true);
  // lf->SetFitWithErrors(false);
  // fRun->AddTask(lf);
  
  // -----   Intialise and run   --------------------------------------------
  fRun->Init();
  //Initialize the Digimapper:
  TpcDigiPar* tpcpar = FairRun::Instance()->GetRuntimeDb()->getContainer("TpcDigiPar");
  TpcLaserGrid::Instance()->Init(tpcpar);
  TpcLaserGrid::Instance()->ReadFile(laserGrid);
  TpcDigiMapper::getInstance()->init(tpcpar);
  //TpcDigiMapper::getInstance()->forceManualDriftVel(forceDriftVel);
  //TpcAlignmentManager::init(tpcpar->getAlignmentFile());
  GFFieldManager::getInstance()->init(new PndFieldAdaptor(fRun->GetField()));
  
  rtdb->print();

  fRun->Run(0,nEvents); // process all events from input file
  // ------------------------------------------------------------------------

  // -----   Finish   -------------------------------------------------------

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

  TpcLaserGrid::Instance()->Destruct();
  TpcDigiMapper::getInstance()->destruct();
  
  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;
  // ------------------------------------------------------------------------

}