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Hi Kerstin, I still don't understand these distributions. They look like vcb background subtracted distributions and not pure MC signal shape. Otherwise I don't understand why you get negative bin values... BTW > again: > black - default > red - feeding only nonres to VirFit > blue - feeding only hybrid to VirFit > > So I think this looks how one would have guessed. well, blue and red should be very very similar (the hydrid has been generated in order to have the same mx shape at mc truth level). Then I would conclude that the difference you have does not seem to be reasonable. > *** default > EFFICIENCY Vub > > Eps_Cut = 0.775344 +- 0.00854322 > Eps_tot = 0.248835 +- 0.00501357 > > *** only nonres > EFFICIENCY Vub > > Eps_Cut = 0.643919 +- 0.013147 > Eps_tot = 0.173261 +- 0.00539021 > > *** only hybrid > EFFICIENCY Vub > > Eps_Cut = 0.949051 +- 0.00674841 > Eps_tot = 0.402175 +- 0.00979597 these values are not making sense. Eps_Cut ~ 1 means that you have only events < 1.5GeV. I presume that, for instance, in the hybrid case the fit is taking into account only the pure resonant part. That can explain why you have basically all the events < 1.5GeV. Please, check again the fit code. The way it is mixing resonant and non-resonant can explain the problem. Daniele