[daip] UVSUB for Stokes Q,U images

[Hanno Spreeuw]

Hello, I have a question about UVSUB.
Can one subtract a Stokes Q image with CCs from a dataset with full Stokes?
I mean does UVSUB then subtract the clean components from the RL and LR 
visibilities instead of RR and LL?
In doing so, does UVSUB implicitly assume that U=0?

Similar, when subtracting Stokes I CCs from RR and LL visibilities, I 
presume that UVSUB assumes V=0?

Thanks,
Hanno.