+//* Jtrack = identity number of the particle: for recoils or *
+//* kerma deposition it can be outside the allowed *
+//* particle id range, assuming values like: *
+//* 208: "heavy" recoil *
+//* 211: EM below threshold *
+//* 308: low energy neutron kerma *
+//* in those cases the id of the particle originating *
+//* the interaction is saved inside J0trck (which othe-*
+//* rwise is zero) *
+//* J0trck = see above *
+//* Ifltrk = flag used for internal debugging (trying to solve *
+//* possible residual issues with Mgdraw driven *
+//* quenching) *