[ROOT] Fitting with error bars

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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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