In TH1 there exist a SetBin(...) functions with which one can nicely
change the number of bins in an existing histogram. However, as no attempt
is made to extend the array which carries the bincontents, this
obviously leads to segmentation violations if the new number of bins is
greater than the old number. I think the SetBin function must be overruled
in TH1F (and TH1S and ...)
Regards,
Wouter