message: Updated title names
  DCAr->DCA_{xy}
diff: @@ -156,9 +156,9 @@ void qatpcAddMetadata(TTree*tree, Int_t verbose){
  // QA variables
  const Int_t nQA=8;
  const TString qaVariableClass[nQA]={"Ncl", "Eff","dEdx", "DCAr", "DCAz","Occ","Attach","Electron"};
  - const TString qaVariableAxisTitle[nQA]={"Ncl(#)", "Eff(unit)","dEdx(MIP/50)", "DCAr(cm)", "DCAz(cm)", "Occupancy","Attach","Electron"};
  - const TString qaVariableLegend[nQA]={"Ncl", "Eff","dEdx", "DCAr", "DCAz","Occ.","Attach","e-"};
  - const TString qaVariableTitle[nQA]={"Ncl", "Eff","dEdx", "DCAr", "DCAz", "Occupancy","Attach","e-"};
  + const TString qaVariableAxisTitle[nQA]={"Ncl(#)", "Eff(unit)","dEdx(MIP/50)", "DCA_{xy}(cm)", "DCA_{z}(cm)", "Occupancy","Attach","Electron"};
  + const TString qaVariableLegend[nQA]={"Ncl", "Eff","dEdx", "DCA_{xy}", "DCA_{z}","Occ.","Attach","e-"};
  + const TString qaVariableTitle[nQA]={"Ncl", "Eff","dEdx", "DCA_{xy}", "DCA_{z}", "Occupancy","Attach","e-"};
  TPRegexp regQAVariable[nQA];
  regQAVariable[0]=TPRegexp("ncl"); // Ncl
  regQAVariable[1]=TPRegexp("tpcitsmatch"); // TPC->ITS eff
  