void run_digi_sttcombi(  Int_t nEvents = 10){
  // ========================================================================
  // Verbosity level (0=quiet, 1=event level, 2=track level, 3=debug)
  Int_t iVerbose = 0;

  // Input file (MC events)
  TString inFile = "data/points_sttcombi.root";

  // Parameter file
  TString parFile = "data/params_sttcombi.root";

  // Output file
  TString outFile = "data/digi_sttcombi.root";


  // ----  Load libraries   -------------------------------------------------
  gROOT->Macro("$VMCWORKDIR/gconfig/rootlogon.C");
  gSystem->Load("libGem");
  TString sysFile = gSystem->Getenv("VMCWORKDIR");
  // ------------------------------------------------------------------------

  // ---  Now choose concrete engines for the different tasks   -------------
  // ------------------------------------------------------------------------

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

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

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

  // ------------------------------------------------------------------------

  // -----  Parameter database   --------------------------------------------
  TString allDigiFile = sysFile+"/macro/params/all.par";

  FairRuntimeDb* rtdb = fRun->GetRuntimeDb();
  FairParRootFileIo* parInput1 = new FairParRootFileIo();
  parInput1->open(parFile.Data());

  FairParAsciiFileIo* parIo1 = new FairParAsciiFileIo();
  parIo1->open(allDigiFile.Data(),"in");

  rtdb->setFirstInput(parInput1);
  rtdb->setSecondInput(parIo1);
  fRun->LoadGeometry();
  // ------------------------------------------------------------------------

  // -------- MVD digtizer & clusterfinder ----------
  PndMvdDigiTask* mvddigi = new PndMvdDigiTask();
  mvddigi->SetVerbose(iVerbose);
  fRun->AddTask(mvddigi);

  Double_t chargecut = 5000., pixelrad=1.8;
  PndMvdClusterTask* mvdmccls = new PndMvdClusterTask(pixelrad,chargecut,inFile);
  mvdmccls->SetVerbose(iVerbose);
  fRun->AddTask(mvdmccls);
	
	// -----   STT analysis tasks   --------------------------------------------
  // digitize ....

  //PndSttHitProducerIdeal* sttHitProducer = new PndSttHitProducerIdeal();
  PndSttHitProducerRealFast* sttHitProducer = new PndSttHitProducerRealFast();
  fRun->AddTask(sttHitProducer);
	
	// trackfinding ....
	PndSttTrackFinderIdeal* sttTrackFinder = new PndSttTrackFinderIdeal(iVerbose);
	PndSttFindTracks* sttFindTracks = new PndSttFindTracks("Track Finder", "FairTask", sttTrackFinder, iVerbose);
	sttFindTracks->AddHitCollectionName("STTHit", "STTPoint");
	fRun->AddTask(sttFindTracks);
	
	// trackmatching ....
	PndSttMatchTracks* sttTrackMatcher = new PndSttMatchTracks("Match tracks", "STT", iVerbose);
	sttTrackMatcher->AddHitCollectionName("STTHit", "STTPoint");
	fRun->AddTask(sttTrackMatcher);
	
	// trackfitting ....
	PndSttTrackFitter* sttTrackFitter = new PndSttHelixTrackFitter(0);
	PndSttFitTracks* sttFitTracks = new PndSttFitTracks("STT Track Fitter", "FairTask", sttTrackFitter);
	sttFitTracks->AddHitCollectionName("STTHit");
	fRun->AddTask(sttFitTracks);
	
	// helix hit production ....
	PndSttHelixHitProducer* sttHHProducer = new PndSttHelixHitProducer();
	fRun->AddTask(sttHHProducer);
	
  // -----   EMC hit producers   ---------------------------------
  PndEmcHitProducer* emcHitProd = new PndEmcHitProducer();
  fRun->AddTask(emcHitProd); // hit production

  //PndEmcMakeDigi* emcMakeDigi=new PndEmcMakeDigi();
  //fRun->AddTask(emcMakeDigi); // fast digitization

  PndEmcHitsToWaveform* emcHitsToWaveform= new PndEmcHitsToWaveform(iVerbose);
  PndEmcWaveformToDigi* emcWaveformToDigi=new PndEmcWaveformToDigi(iVerbose);
  fRun->AddTask(emcHitsToWaveform);  // full digitization
  fRun->AddTask(emcWaveformToDigi);  // full digitization

  PndEmcMakeCluster* emcMakeCluster= new PndEmcMakeCluster(iVerbose);
  fRun->AddTask(emcMakeCluster);

  PndEmcMakeBump* emcMakeBump= new PndEmcMakeBump();
  fRun->AddTask(emcMakeBump);

  PndEmcHdrFiller* emcHdrFiller = new PndEmcHdrFiller();
  fRun->AddTask(emcHdrFiller); // ECM header

  // -----   GEM hit producers   ---------------------------------
  PndGemDigitize* gemDigitize = new PndGemDigitize("GEM Digitizer", iVerbose);
  fRun->AddTask(gemDigitize);
  
  PndGemFindHits* gemFindHits = new PndGemFindHits("GEM Hit Finder", iVerbose);
  fRun->AddTask(gemFindHits);
  
  // -----   TOF hit producers   ---------------------------------
//
//  PndTofHitProducerIdeal* tofhit = new PndTofHitProducerIdeal();
//  tofhit->SetVerbose(iVerbose);
//  fRun->AddTask(tofhit);

  // -----   MDT hit producers   ---------------------------------
  PndMdtHitProducerIdeal* mdtHitProd = new PndMdtHitProducerIdeal();
  mdtHitProd->SetPositionSmearing(0.2); // position smearing [cm]
  fRun->AddTask(mdtHitProd);

  PndMdtTrkProducerIdeal* mdtTrkProd = new PndMdtTrkProducerIdeal();
  fRun->AddTask(mdtTrkProd);

//  // -----   DRC hit producers   ---------------------------------
//  PndDrcHitProducerIdeal* drchit = new PndDrcHitProducerIdeal();
//  drchit->SetVerbose(iVerbose);
//  fRun->AddTask(drchit);

  // -----   Intialise and run   --------------------------------------------
  fRun->Init();
  fRun->Run(0, nEvents);

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

  // ------------------------------------------------------------------------

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

  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 " << parFile << endl;
  cout << "Real time " << rtime << " s, CPU time " << ctime << " s" << endl;
  cout << endl;
  // ------------------------------------------------------------------------


}