using TH1::Fit()

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Hi,

In continuation to my former question, the following:

1) Which error values does TH1::Fit() use? Does it use the errors in the
histogram (GetBinError) and, if no errors are specified, does it use the
sqrt of the BinContent ?  The answer to this is hidden in an external
function H1FitChiSquare, I think. Maybe the answer can be added to the
Fit-howto??

2) Is there an easy/elegant way to check whether parameters have hit their
limit? I found abs(cos(fX[i-1])) < 0.001 in mnprin, but isn't there some
other way?? By the way, what does the second parameter to TMinuit::mnprin()
do?

Thanks,

Marco van Leeuwen.

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