[PWGCF] Configurable multiplicity correlation axes

PWGCF/Tasks/correlations.cxx

@@ -1,4 +1,4 @@
 // Copyright 2019-2020 CERN and copyright holders of ALICE O2.
 // See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
 // All rights not expressly granted are reserved.
 //
@@ -122,6 +122,10 @@
 
   ConfigurableAxis axisInvMass{"axisInvMass", {VARIABLE_WIDTH, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2.0, 5.0}, "invariant mass axis for histograms"};
 
+  ConfigurableAxis axisMultCorrCent{"axisMultCorrCent", {100, 0, 100}, "multiplicity correlation axis for centralities"};
+  ConfigurableAxis axisMultCorrV0{"axisMultCorrV0", {1000, 0, 100000}, "multiplicity correlation axis for V0 multiplicities"};
+  ConfigurableAxis axisMultCorrMult{"axisMultCorrMult", {1000, 0, 1000}, "multiplicity correlation axis for track multiplicities"};
+
   // This filter is applied to AOD and derived data (column names are identical)
   Filter collisionZVtxFilter = nabs(aod::collision::posZ) < cfgCutVertex;
   // This filter is only applied to AOD
@@ -190,13 +194,13 @@
         LOGF(fatal, "cfgMultCorrelationsMask can not be 0 when MultSet process functions are in use.");
       std::vector<AxisSpec> multAxes;
       if (cfgMultCorrelationsMask & aod::cfmultset::CentFT0C)
-        multAxes.emplace_back(100, 0, 100, "FT0C centrality");
+        multAxes.emplace_back(axisMultCorrCent, "FT0C centrality");
       if (cfgMultCorrelationsMask & aod::cfmultset::MultFV0A)
-        multAxes.emplace_back(1000, 0, 100000, "V0A multiplicity");
+        multAxes.emplace_back(axisMultCorrV0, "V0A multiplicity");
       if (cfgMultCorrelationsMask & aod::cfmultset::MultNTracksPV)
-        multAxes.emplace_back(100, 0, 1000, "Nch PV");
+        multAxes.emplace_back(axisMultCorrMult, "Nch PV");
       if (cfgMultCorrelationsMask & aod::cfmultset::MultNTracksGlobal)
-        multAxes.emplace_back(100, 0, 1000, "Nch Global");
+        multAxes.emplace_back(axisMultCorrMult, "Nch Global");
       registry.add("multCorrelations", "Multiplicity correlations", {HistType::kTHnSparseF, multAxes});
     }
     registry.add("multiplicity", "event multiplicity", {HistType::kTH1F, {{1000, 0, 100, "/multiplicity/centrality"}}});
@@ -391,7 +395,7 @@
 
               if (cfgCorrelationMethod == 1 && track1.decay() != track2.decay())
                 continue;
               if (cfgCorrelationMethod == 2 && track1.decay() == track2.decay())
                 continue;
               registry.fill(HIST("invMassTwoPart"), track1.invMass(), track2.invMass(), track1.pt(), track2.pt(), multiplicity);
               registry.fill(HIST("invMassTwoPartDPhi"), track1.invMass(), track2.invMass(), track1.pt(), track2.pt(), TVector2::Phi_0_2pi(track1.phi() - track2.phi() + TMath::Pi() / 2.0) - TMath::Pi() / 2.0);
@@ -649,7 +653,7 @@
         if constexpr (std::experimental::is_detected<HasDecay, typename TTracks1::iterator>::value && std::experimental::is_detected<HasDecay, typename TTracks2::iterator>::value) {
           if (cfgCorrelationMethod == 1 && track1.decay() != track2.decay())
             continue;
           if (cfgCorrelationMethod == 2 && track1.decay() == track2.decay())
             continue;
         }