[PWGCF] FemtoUniverse: Adding FDExtCollisions table (#8547)

Author: prchakra

PWGCF/FemtoUniverse/DataModel/FemtoDerived.h

@@ -31,6 +31,8 @@ DECLARE_SOA_COLUMN(MultV0M, multV0M, float);       //! V0M multiplicity
 DECLARE_SOA_COLUMN(MultNtr, multNtr, int);         //! multiplicity of charged tracks as defined in the producer
 DECLARE_SOA_COLUMN(Sphericity, sphericity, float); //! Sphericity of the event
 DECLARE_SOA_COLUMN(MagField, magField, float);     //! Magnetic field of the event
+DECLARE_SOA_COLUMN(IRrate, irrate, float);         //! Interaction rate
+DECLARE_SOA_COLUMN(Occupancy, occupancy, int);     //! TPC occupancy
 
 } // namespace femtouniversecollision
 
@@ -43,6 +45,11 @@ DECLARE_SOA_TABLE(FDCollisions, "AOD", "FDCOLLISION",
                   femtouniversecollision::MagField);
 using FDCollision = FDCollisions::iterator;
 
+DECLARE_SOA_TABLE(FDExtCollisions, "AOD", "FDEXTCOLLISION",
+                  femtouniversecollision::IRrate,
+                  femtouniversecollision::Occupancy);
+using FDExtCollision = FDExtCollisions::iterator;
+
 /// FemtoUniverseTrack
 namespace femtouniverseparticle
 {