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Hi Antonio, could you please try for the two mX bins with the bad chi^2 to find a better fit? Maybe the result for the first mX bin can be used to find reasonable start parameters for the fits. Once you have fixed it could you please determine then the new corrcetion factors and see if the fit to the mX spectrum is well behaved? Cheers, Heiko On Wed, 5 Jul 2006, Antonio Petrella wrote: > Hi, > > we also computed a correction factor for the signal/peaking bkg using > the entire mx distribution, not a bin by bin. > > In this case the fit looks better, with respect to the bin by bin one: > > http://www.slac.stanford.edu/~petrella/tmp/scra/Ibutest_fix129/test_fix129fitresults.eps > http://www.slac.stanford.edu/~petrella/tmp/scra/Ibutest_fixed/test_fixedfitresults.eps > > cheers, > Antonio >