Hi Rooters, I am fitting a histogram hyds with a gaussian according to : g = new TF1("g","gaus",gmin, gmax); hyds->Fit("g","ER0"); g->GetParameters(par); hyds->Draw() ; I got the following on my root-command-screen FCN=66.6685 FROM MINOS STATUS=PROBLEMS 1282 CALLS 1694 TOTAL EDM=2.55251e-05 STRATEGY= 2 ERROR MATRIX ACCURATE EXT PARAMETER PARABOLIC MINOS ERRORS NO. NAME VALUE ERROR NEGATIVE POSITIVE 1 Constant 1.47776e+02 4.41311e+00 -3.80487e+00 3.80193e+00 2 Mean -2.83708e-04 3.83873e-04 -3.99915e-04 3.99098e-04 3 Sigma 1.52598e-02 2.16818e-06 but on the graphics an information-window is appearing with the hist- parameters (I do believe) not the fit ones : hyds Nent = 1600 Mean = -0.00539024 RMS = 0.14343 is it a bug ? Faouzi
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