message: adding monitoring variable to streamers
  last diff in error param
diff: @@ -332,7 +332,7 @@ Int_t AliTPCtracker::AcceptCluster(AliTPCseed * seed, AliTPCclusterMI * cluster)
  // tree->SetAlias("Occu6N", "Occu6*(1.+83/Cl.fX)*0.5");
  // tree->SetAlias("posRatio", "(Cl.fBaselineTailPos/Cl.fMax)");
  // tree->SetAlias("negRatio", "(Cl.fBaselineTail/Cl.fMax)");
  - Float_t occu6N=occu6*(1+kXinner/cluster->GetX());
  + Float_t occu6N=occu6*(1+kXinner/cluster->GetX())*0.5;
  Float_t posRatio=cluster->GetBaselineTailPos()/(0.1+cluster->GetMax());
  Float_t negRatio=cluster->GetBaselineTail()/(0.1+cluster->GetMax());
  // tree->SetAlias("erry2OccudEdx", "0.12*0.12*Occu6N*mdEdx");
  