Simulating PSSR+/PSSR- and CMRR

Hello,

I would like to simulate the PSSR+/PSSR- and the CMMR using xf for the attached test bench.

Normally, I do the AC analysis and using the post-processing capability of cadence spectre I do 20log(vdd/vout) for PSSR+

and 20*log(vss/vout) for PSSR-. 

looked online from an old post that I do:

PSRR-
db20(1/DATA("/Vn/PLUS" "xf-xf"))

PSRR+
db20(1/DATA("/Vp/MINUS" "xf-xf"))

How about the for the CMRR?

Thanks a lot in advance.