acro <tt>rf111_derivatives.C</tt>
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   <img src="roofit_524_derivatives.gif" alt="Graphics Output of macro rf111_derivatives">
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<h4>Improved handling of chi-squared fits</h4>

<p>Chi-squared fits can now be performed through the same style of interface as likelihood fits,
through the newly added method <tt>RooAbsReal::chi2FitTo(const RooDataHist&,...)</tt>.

<p>Functions that can be fitted with chi-squared minimization are any <tt>RooAbsReal</tt> based function
as well as <tt>RooAbsPdf</tt