void test(int minslice,int maxslice,char *rootfile=0,int nevent=1)
{
  AliL3Logger l;
  l.Set(AliL3Logger::kAll);
  l.UseStdout();
  l.UseStream();
  
  for(Int_t ev=0; ev<nevent; ev++)
    {
      if(!rootfile)
	a = new AliLevel3();
      else
	a = new AliLevel3(rootfile);

      //a->Init("/usr/local/anders/data/hg_42105_s1-3/");
      a->Init("/prog/alice/data/Rawdata/6_patch/hg_1000_s1-3/");
      //a->Init("/prog/alice/data/Rawdata/6_patch/1track_s1/");
      //a->Init("/prog/alice/data/Rawdata/6_patch/pp/event_0/");
      //a->Init("/prog/alice/data/Rawdata/1_patch/pp/pileups/event_1/");

      //  a->DoRoi();
      //a->DoMc();
      
      Int_t phi_segments,eta_segments,trackletlength,tracklength;
      Int_t rowscopetracklet,rowscopetrack;
      Double_t min_pt_fit,maxangle,goodDist,hitChi2Cut;
      Double_t goodHitChi2,trackChi2Cut,maxphi,maxeta;
      
      phi_segments = 50;//50;
      eta_segments = 100;//100;
      trackletlength = 3;
      tracklength = 5;
      rowscopetracklet = 2;
      rowscopetrack = 2;
      min_pt_fit = 0;
      maxangle = 1.31;
      goodDist = 5;
      maxphi=100;
      maxeta=100;
      hitChi2Cut = 100;
      goodHitChi2 = 20;
      trackChi2Cut = 50;
       
      //main vertex tracking parameters:
       a->SetTrackerParam(phi_segments,eta_segments,trackletlength,tracklength,
			 rowscopetracklet,rowscopetrack,
			 min_pt_fit,maxangle,goodDist,hitChi2Cut,
			 goodHitChi2,trackChi2Cut,50,maxphi,maxeta,kTRUE);
      
       a->WriteFiles();
       a->ProcessEvent(minslice,maxslice);
       //a->DoBench("benchmark_0");
       delete a;
    }
  
}