[PWGLF] relative azimuthal angle to be configurable (#12405)

Author: jikim1290

PWGLF/Tasks/Resonances/f0980pbpbanalysis.cxx

@@ -135,6 +135,7 @@ struct F0980pbpbanalysis {
   ConfigurableAxis massAxis{"massAxis", {400, 0.2, 2.2}, "Invariant mass axis"};
   ConfigurableAxis ptAxis{"ptAxis", {VARIABLE_WIDTH, 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 6.0, 7.0, 8.0, 10.0, 13.0, 20.0}, "Transverse momentum Binning"};
   ConfigurableAxis centAxis{"centAxis", {VARIABLE_WIDTH, 0, 5, 10, 20, 30, 40, 50, 60, 70, 80, 100}, "Centrality interval"};
+  ConfigurableAxis epAxis{"epAxis", {6, 0.0, o2::constants::math::TwoPI}, "EP axis"};
 
   // for event mixing
   SliceCache cache;
@@ -591,7 +592,6 @@ struct F0980pbpbanalysis {
 
   void init(o2::framework::InitContext&)
   {
-    AxisSpec epAxis = {6, 0.0, o2::constants::math::TwoPI};
     AxisSpec qaCentAxis = {110, 0, 110};
     AxisSpec qaVzAxis = {100, -20, 20};
     AxisSpec qaPIDAxis = {100, -10, 10};