//class member function (not object member function)
static void UnfoldingChiSquare(Int_t & nPar, Double_t * Grad, Double_t & fret, Double_t * x, Int_t iflag) ;
// Chi^2 of the fit. Should be static to be passes to MINUIT
//class member function (not object member function)
static void UnfoldingChiSquare(Int_t & nPar, Double_t * Grad, Double_t & fret, Double_t * x, Int_t iflag) ;
// Chi^2 of the fit. Should be static to be passes to MINUIT