message: Use cross section from header for HepMC events
diff: @@ -653,6 +653,11 @@ void AliAnalysisTaskEmcal::UserExec(Option_t *option)
  fHistXsection->Fill(fPtHardBinGlobal, fPythiaHeader->GetXsection());
  }
  + if(fIsHepMC && fHepMCHeader) {
  + fHistXsection->Fill(fPtHardBinGlobal, fHepMCHeader->sigma_gen());
  + fHistTrials->Fill(fPtHardBinGlobal, fHepMCHeader->ntrials());
  + }
  +
  if (IsEventSelected()) {
  if (fGeneralHistograms) fHistEventCount->Fill("Accepted",1);
  }
  