// Loads a file with points, makes digitization, reconstruction and Kalman filtering
  // producing objects of Track type

void runDigiRecoFit(Int_t nEvents = 0){ 
  
  // Verbosity level (0=quiet, 1=event level, 2=track level, 3=debug)
  Int_t iVerbose = 0; 
  
   // Base File name
  TString base="tst";
  // Input file (MC events)
  TString inFile = base+".root";
  //Parameter file
  TString parFile = base+".param.root";
  // Output file
  TString outFile = base+".recoReal.root";
  
  // -----   Timer 
  TStopwatch timer;
  timer.Start();
    
  // -----   Reconstruction run
  FairRunAna *fRun= new FairRunAna();
  fRun->SetInputFile(inFile);
  fRun->SetOutputFile(outFile);
  // -----  Parameter database
  FairRuntimeDb* rtdb = fRun->GetRuntimeDb();
  FairParRootFileIo* parInput1 = new FairParRootFileIo();
  parInput1->open(parFile.Data());
  rtdb->setFirstInput(parInput1);
  rtdb->Print();

  // -----   Add tasks
  // ------------------------------------------------- 
  PndDchDigiProducer* digiProducer= new PndDchDigiProducer();
  digiProducer->SetVerbose(0);
  fRun->AddTask(digiProducer);
  // -------------------------------------------------   
  PndDchCylinderHitProducer* cylHitProducer= new PndDchCylinderHitProducer();
  cylHitProducer->SetVerbose(0);
  fRun->AddTask(cylHitProducer);
   //------ Ideal DCH track finder --------------------
  PndDchFindTracks* finderTask = new PndDchFindTracks("dchFindTracks");
  finderTask->SetUseHitOrDigi("chit");
  finderTask->SetVerbose(0);
  fRun->AddTask(finderTask);
  // ------------------------------------------------- 
  PndDchTrackFinderIdealCylHit* mcTrackFinder = new  PndDchTrackFinderIdealCylHit();
  mcTrackFinder->SetVerbose(0);  
  mcTrackFinder->SetPrimary(1);  // 1 = Only primary tracks are processed, 0 = all (default)
  finderTask->UseFinder(mcTrackFinder);
  //--------------------------------------------------
  PndDchMatchTracks *matchTask = new PndDchMatchTracks();//match PndDchTracks and MCTracks
  matchTask->SetUseHitOrDigi("chit");
  matchTask->SetVerbose(0);
  fRun->AddTask(matchTask);
  // ----- Prepare GEANE --------------------------------------------
  // this will load Geant3 and execute setup macros to initialize geometry:
  FairGeane *Geane = new FairGeane(inFile);
  // ------------------------------------------------- 
    PndDchPreFitterTR* dchPreFitter = new PndDchPreFitterTR();
  dchPreFitter->SetVerbose(0);
  fRun->AddTask(dchPreFitter);
  // ------------------------------------------------- 
  PndDchPreFitterTRQATask* dchPreFitterQA = new PndDchPreFitterTRQATask();
  dchPreFitterQA->SetVerbose(0);
  fRun->AddTask(dchPreFitterQA);
  // ------------------------------------------------- 
  PndDchPrepareKalmanTracks2 *prepareKalmanTracks = new PndDchPrepareKalmanTracks2();
  prepareKalmanTracks->SetVerbose(0);
  prepareKalmanTracks->UseGeane(kTRUE);
  prepareKalmanTracks->UseMC(kFALSE);
  prepareKalmanTracks->SetPDG(13);
  prepareKalmanTracks->SetPersistence();
  fRun->AddTask(prepareKalmanTracks);
  // ------------------------------------------------- 
  PndDchKalmanTask2* dchKalman = new PndDchKalmanTask2();
  dchKalman->SetVerbose(5);
  dchKalman->SetNumIterations(2);
  fRun->AddTask(dchKalman);
  // ------------------------------------------------- 
  PndDchKalmanQATask* dchKalmanQA = new PndDchKalmanQATask();
  dchKalmanQA->SetVerbose(0);
  dchKalmanQA->SetApproach(1);
  dchKalmanQA->ApplySignPatch(kFALSE);
  fRun->AddTask(dchKalmanQA);
  // ------------------------------------------------- 

  // -----   Intialise and run 
  cout << "fRun->Init()" << endl;
  fRun->Init();
  Geane->SetField(fRun->GetField());
  fRun->Run(0,nEvents);

  //dchPreFitterQA->PlotHistograms();
  dchKalmanQA->PlotHistograms();
  
// -----   Finish
  timer.Stop();
  Double_t rtime = timer.RealTime();
  Double_t ctime = timer.CpuTime();
  cout << endl << endl;
  cout << "Macro finished successfully." << endl;
  cout << "Output file is "    << outFile << endl;
  cout << "Real time " << rtime << " s, CPU time " << ctime << " s" << endl;
  cout << endl;
  //    exit(0);
}