CST Studio Suite Farfield Result information interpreting

I'm running simulations for an antenna patch, and i'm trying to understand the farfield 3d information that shows from green to red with numerical values assigned to this a side bar showing green to red. I remember that the more red the numerical value, the more round the corner of a square antenna patch physically has, but that's the extent of my memory. Could there be more drawn from what i'm seeing?

This patch "delta a" as in the corners of the antenna patch rounded out significantly. "delta a" = 15

This patch "delta a" as in the corners of the antenna patch rounded out significantly. "delta a" = 5

This patch "delta a" as in the corners of the antenna patch rounded out significantly. "delta a" = 0

Also, could each of the farfield graphing option be simply be explained to me please?