virtual Int_t GetNDigits() const = 0;
/// Return Id of digits i
virtual UInt_t GetDigitId(Int_t i) const = 0;
+ /// Return the array of digits'id
+ virtual const UInt_t* GetDigitsId() const {return 0x0;}
/// Set chi2 of cluster
virtual void SetChi2(Double_t chi2) = 0;