Multigraph with right scaled axis

Hi,

I want to obtain a multigraph with three histograms (the last = the substraction of the two first ). I don’t find the way to have a multigraph with the second axis (corresponding to the last histo ) in the right, and with a different scale) … how must I proceed?

Thanks,

Tatjana
[/home/pn/fault/example.jpg]

Hi, I think this is already explained in one of tutorial example in hist directory, called twoscales.C.