Rebinning a histogram to achieve better precision (#3248)

Author: zjxiongOvO

PWGDQ/Core/HistogramsLibrary.cxx

@@ -410,7 +410,7 @@ void o2::aod::dqhistograms::DefineHistograms(HistogramManager* hm, const char* h
       hm->AddHistogram(histClass, "pdca_vs_Rabs", "pDCA vs R_{abs}", false, 100, 0., 200., VarManager::kMuonRAtAbsorberEnd, 200, 0.0, 1000., VarManager::kMuonPDca);
     }
     if (subGroupStr.Contains("mc")) {
-      hm->AddHistogram(histClass, "Pt_vs_PtMC", "pT vs MC pT", false, 50, 0.0, 10.0, VarManager::kPt, 50, 0.0, 10.0, VarManager::kMCPt);
+      hm->AddHistogram(histClass, "Pt_vs_PtMC", "pT vs MC pT", false, 200, 0.0, 20.0, VarManager::kPt, 4000, 0.0, 40.0, VarManager::kMCPt);
       hm->AddHistogram(histClass, "Eta_vs_EtaMC", "#eta vs MC #eta", false, 50, -1.0, 1.0, VarManager::kEta, 50, -1.0, 1.0, VarManager::kMCEta);
       hm->AddHistogram(histClass, "Phi_vs_PhiMC", "#varphi vs MC #varphi", false, 50, 0.0, 2. * TMath::Pi(), VarManager::kPhi, 50, 0.0, 2. * TMath::Pi(), VarManager::kMCPhi);
       hm->AddHistogram(histClass, "TrackPDGcode", "PDG code of track", false, 10001, -5000, 5000, VarManager::kMCPdgCode);