There is a change in the drawing of the graph image！

[lujifei]

Klein-Nishina Formula:
Here’s my code for using TGraphPolar for plotting.
compton.cpp (2.3 KB)
Why does drawing four graphs give a different result than drawing just the fourth graph?

[couet]

I’ll check

[couet]

The first graph drawn defines the axis. If you want both plots to have the same axis definition, always draw the same graph first.

compton.cpp (2.1 KB)

[lujifei]

Thanks for your help.

[couet]

Also as it seems you are in Radian, you need the following lines after drawing:

   c1->Update();
   grP4->GetPolargram()->SetToRadian();