Make mass axis configurable

Author: fchinu

PWGHF/TableProducer/candidateCreator2Prong.cxx

@@ -108,6 +108,9 @@ struct HfCandidateCreator2Prong {
   double bz{0.};
 
   std::shared_ptr<TH1> hCandidates;
+
+  ConfigurableAxis axisMass{"axisMass", {500, 1.6, 2.1}, "axis for mass (GeV/c^2)"};
+
   HistogramRegistry registry{"registry"};
 
   void init(InitContext const&)
@@ -140,7 +143,7 @@ struct HfCandidateCreator2Prong {
     }
 
     // histograms
-    registry.add("hMass2", "2-prong candidates;inv. mass (#pi K) (GeV/#it{c}^{2});entries", {HistType::kTH1F, {{500, 1.6, 2.1}}});
+    registry.add("hMass2", "2-prong candidates;inv. mass (#pi K) (GeV/#it{c}^{2});entries", {HistType::kTH1F, {axisMass}});
     registry.add("hCovPVXX", "2-prong candidates;XX element of cov. matrix of prim. vtx. position (cm^{2});entries", {HistType::kTH1F, {{100, 0., 1.e-4}}});
     registry.add("hCovSVXX", "2-prong candidates;XX element of cov. matrix of sec. vtx. position (cm^{2});entries", {HistType::kTH1F, {{100, 0., 0.2}}});
     registry.add("hCovPVYY", "2-prong candidates;YY element of cov. matrix of prim. vtx. position (cm^{2});entries", {HistType::kTH1F, {{100, 0., 1.e-4}}});