Cross polarisation doubt

hii everyone.....I have seen in a few IEEE papers of graphs showing the level of cross polarisation. But i dont understand it is which parameter vs which parameter .One of it for sure is the angle and what about the other?is it power or gain.....when i see in IE3d sofware im able to obtain graphs for onlythe gain vs the angle......Can anyone plz telll me how do i obtain it for power vs angle..