What is exactly Gaintotal, GainLHCP and GainRHCP for HFSS?

I want to know what is exactly Gaintotal, GainLHCP, GainRHCP for HFSS.
And for a linear polarization, which result are we suppose to have for GainLHCP and for GainRHCP ?

Thanks for your answers,
Ludovic

hi Ludovic:

the Gaintotal is the gain we acount in respect to the total E field density, and GainRHCP is the gain we only count the RHCP E field density, on contrary is GainLHCP.
and for linear polarization,the GainRHCP and GainLHCP is best to be same.

Thank you Cybcad
You are very helpful