Alignment of negative bin content histogram

Hello, I have a 1D histogram (actually a vertical bar-chart) filled with negative values (see attached plot). Is it possible to align the bar on the top of the histogram (let’s say all the bars start at y=0)?
Can you help me?
Thanks a lot in advance.
Regards
Davide Perego


Yes, see:
root.cern.ch/root/html/THistPainter.html#HP20