Float_t fIPDistance ; // Distance of the inner surface to the interaction point
Float_t fShellThickness ; // Total thickness in (x,y) direction
Float_t fZLength ; // Total length in z direction
Float_t fIPDistance ; // Distance of the inner surface to the interaction point
Float_t fShellThickness ; // Total thickness in (x,y) direction
Float_t fZLength ; // Total length in z direction