By the way, you may be interested in this code attached here, which does something similar to what you want, i.e. the Klein-Nishina cross section and Compton edge analysis, but in normal histograms. Should not be a big deal to convert to polar graphs. See http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-204988 for details on the notation.
The documentation is not very clear at this point. It should rather say:
Enter a number N = i*100 + j, where i (0-99) are the major radial divisions and j (0-99) are the minor ones. So j should occupy always 2 digits.
I know this should be in another topic, but in any case.
Do you know how to import UTF8 in titles. I need to use some Spanish accents (tildes) but
from all the available accents here https://root.cern.ch/doc/master/classTLatex.html
the most similar is #acute, again this can be esthetics, but the way those accents looks are not so good. Even in the same example they provide you can realize it.