Hi, I have a question about the usage of TGraphErrors(n,x,y). Can we set the errors on both x and y equal to zero and then fit the graph with a given function? I've tried to do so, and from what I can see the quality of the fit is not very good (I try to avoid the usage ot TGraph since sometimes I have errors and sometimes I don't). Someone gets a much better quality if he specifies a small non-zero error. If that's the case (small non-zero errors) is there any special value that gives the best fit or the smaller errors the better? Thanks! Stelios.
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