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Hi Antonio, maybe this is not too surprising after all since the first bin contains the largest fraction of the signal. Now, that I'm thinking of it: there is a fit function which would avoid the problem of becoming negative, but which would nevertheless give probably a reasonable fit to the correction factors: a Gaussian. Cheers, Heiko On Wed, 13 Sep 2006, Antonio Petrella wrote: > Hi all, > > here are the results of the jobs with new correction factors strategy > (i.e. fit with a first order polynomial starting from the second bin): > > PBRBR= (109 +- 10 +- 4) e^-4 > chi^2 of the mx fit = 25.12/7 > > I also run the systematics and the value I get is > sigma=22.5% > > These are the values that I should add to the talk, but are not > encouraging... > > Antonio >