circular polarization type determination

Hello,in the CST manual which is presented bellow,they dont go to the specifics of the meaning of
"combining results",i khow that there should be a phase shift of 90 degreen between the components
in order to see if its right hand or left hand polarization.
but what should i do specificly in CST to determine this?

Or if i Plot in Ludwig-3 coordinated how to know if its left hand or right hand polarization,an example would be appriciated.

Thanks.