Int_t GetNdf() const { return fNdf; }
Int_t GetMinNPoints() const { return fMinNPoints; }
void FixParameter(Int_t par,Float_t value=0.) {fBFixed[par]=kTRUE; fFixed[par]= value;}
+ Int_t GetNFreeParam();
void ReleaseParameter(Int_t par) {fBFixed[par]=kFALSE;}
protected: