How to represent two graphs in one figure

Positron anihilation distance in not a tree. I want to display two different graphs of positron anihilation distance (i.e two different simulations) in one figure. Is there anyone who can help me?

Thanks in advance.

It depends what you are using to draw the graphs. But lets asume you are using 2 TGraph g1 and g2. You sould draw the 1st graph, g1, using option A plus some plotting options and the 2nd one, g2, using on only plotting options. Example: