Maybe you found this out already, but in case you didn't:
Back in February, you were asking about output format in .meas statements. I told you to try .opt meascplxfmt, and we both found it didn't work.
I had occasion to try again today, and found out why.
".opt meascplxfmt cartesian" doesn't work.
"opt meascplxfmt=cartesian" does.
The equals sign is all important. I knew I'd used it before,a long time ago, but just couldn't remember how.