message: Small change in the tree maker, to mark in fEventTag those events which
  do not fulfill criterias to be written in the trees, but are selected for writing randomly.
diff: @@ -526,7 +526,7 @@ void AliAnalysisTaskReducedTreeMaker::UserExec(Option_t *option)
  if(nTracks2>0) {
  if(fWriteEventsWithNoSelectedTracks) {
  writeEvent = kTRUE;
  - // event statistics, event with no POI tracks, but with assoc tracks -> written
  + // event statistics, event with no POI tracks, but with base tracks -> written
  for(Int_t i=0;i<32;++i)
  if(inputHandler->IsEventSelected() & (UInt_t(1)<<i)) fEventsHistogram->Fill(7.,Double_t(i));
  }
  @@ -546,7 +546,8 @@ void AliAnalysisTaskReducedTreeMaker::UserExec(Option_t *option)
  }
  else if(gRandom->Rndm()<fScaleDownEventsWithNoSelectedTracks) {
  writeEvent = kTRUE;
  - // event statistics, event with no POI tracks, and no assoc tracks -> written
  + fReducedEvent->fEventTag |= (ULong64_t(1)<<14); // mark unbiased events
  + // event statistics, event with no POI tracks, and no assoc tracks -> written (random selection)
  for(Int_t i=0;i<32;++i)
  if(inputHandler->IsEventSelected() & (UInt_t(1)<<i)) fEventsHistogram->Fill(8.,Double_t(i));
  }
  