[daip] SDGRD/PRTSD/SDIMG and XX and YY data?

[Eric Greisen]

I suppose that I can allow the tasks to make XX and YY images and even
I = (XX+YY)/2 but this all assumes that the polarization have been
calibrated and corrected so linear is always vertical/horizontal etc.
I do not know what you mean to do with tis information - polarization
in SD data in aips is not handled at all so far as I know and that
goes double for linear polarization which we also do not handle well
in interferometric data.

If there are polarization algorithms that should be added to aips,
people will have to describe them to me in detail...

Eric Greisen