virtual Int_t ISector() = 0;
// calculate sector from pad coordinates
virtual Int_t Sector(Int_t ix, Int_t iy) = 0;
+ virtual Int_t Sector(Float_t x, Float_t y) = 0;
//
// Signal Generation Condition during Stepping
virtual Int_t SigGenCond(Float_t x, Float_t y, Float_t z) = 0;