message: allowing nano field as centrality axis input
diff: @@ -1538,6 +1538,17 @@ Double_t AliAnalysisTaskPhiCorrelations::GetCentrality(AliVEvent* inputEvent, TO
  {
  centrality = ((AliNanoAODHeader*) fAOD->GetHeader())->GetCentrality();
  }
  + else if (fCentralityMethod.BeginsWith("Nano."))
  + {
  + AliNanoAODHeader* nanoHeader = dynamic_cast<AliNanoAODHeader*>(fAOD->GetHeader());
  + if (!nanoHeader)
  + AliFatal("Nano Header not found");
  +
  + static TString nanoField = fCentralityMethod(5, fCentralityMethod.Length());
  + static const Int_t kField = nanoHeader->GetVarIndex(nanoField);
  +
  + centrality = nanoHeader->GetVar(kField);
  + }
  else if (fCentralityMethod == "PPVsMultUtils")
  {
  if (fAnalysisUtils) centrality = fAnalysisUtils->GetMultiplicityPercentile(inputEvent);
  