> based p.d.f.s. In case of non-extended p.d.f.s the probability density
calculated by the p.d.f. is multiplied with the number of events in the histogram to adjust
the scale of the function. In case of extended p.d.f.s, the adjustment is made with the expected
number of events, rather than the observed number of events.

Tutorial macro <tt>rf602_chi2fit.C</tt> has been updated to use this new interface.


<h4>Chi-squared fits to X-Y datasets now possible</h4>

<p>In addition to the ability to perform chi-s