[daip] FITS tapes and Stokes Parameters

[Eric Greisen]

Mark Reid wrote:
> Dear Designated Aipser:
> 
>     A while ago I made some FITS tapes with FITAB and today restored the 
> files to disk.  However, I'm getting an "incompatible Stokes Parameters" 
> message from LISTR/MATX or POSSM.   The only way I can do anything with 
> the data is to say STOKES='I'.
> 
> The data is RCP and LCP and the header says it has STOKES=2.
> 
> I did notice that the Stokes Coord vlaue is 1.0 and the Coord incr is 
> 3.0.  This looks wrong.  Is it, and, if so, is this a bug in FITAB or 
> FITLD?   Can it be fixed with PUTH, and, if so, what values should I
> "put"?

You must have told FITAB to convert to true Stokes and it took RR and LL 
and made I and V.  That is what you now have...

Perhaps FITAB and FITTP should not be able to do this and instead we 
should have a task to do it on disk.

ERic Greisen