[daip] CLCOR modification for XY-EW mounts

[Eric Greisen]

Cormac Reynolds wrote:
> hi,
> 
> we have recently correlated data from the Hobart 26-m telescope. This
> telescope has an XY-EW mount. Due to a software error the wrong axis
> offset was used for the correlator model. CLCOR has an 'ANAX' option
> to fix an axis offset error, but does not do the right thing for XY-EW
> mounts (which it currently treats as ALTAZ). Actually, the fix for
> XY-EW is rather similar to ALTAZ, but the delay/rate computation needs
> a different component of the source direction vector.
> 
> I modified a recent version of CLCOR to do the correct thing for XY-EW
> mounts (mount type 3 in AIPS). It is attached to this message (renamed
> CRCOR.FOR for test purposes). The changes are straightforward and
> appear in lines 3477 - 3510 of the attached file. I've tested it on a
> few experiments from the Curtin DiFX installation that were affected
> by the model bug, and it appears to do the right thing. Would it be
> possible to get this fix incorporated into a release version of AIPS?
> I'd like to share it with other LBA users who were also affected by
> the bug.

I have installed your correction.  A MNJ after tonight should update the 
code.  Many thanks - things like this are beyond my ability to find and 
fix without help.

Eric Greisen