Notes        -----        Until numpy release 1.5, the underlying numpy histogram function was        incorrect with `normed`=`True` if bin sizes were unequal.  MPL        inherited that error.  It is now corrected within MPL when using        earlier numpy versions.

        # hist_kwargs = dict(range=range, normed=bool(normed))        # We will handle the normed kwarg within mpl until we        # get to the point of requiring numpy >= 1.5.