the correlative plot view should be good for you then. 
You calibrate to Sigma0, then import your measurements and plot them against the incidence angle.
Make sure to select “Incidence Angle From Ellipsoid” and/or “Local incidence angle” during the terrain correction, so you can also use this for your analyses:
I used random point values in my example so the plots do not look very nice, but it technically works.
