[daip] problem with velocity definition in headers

[Lynn D. Matthews]

I've identified the missing keyword. Problem solved.

On Fri, 22 Feb 2008, Lynn D. Matthews wrote:

> I have some GBT maps that I've converted to fits and imported into AIPS
> using UVLOD (or FITLD).  However, I'm having a minor problem in that AIPS
> does not want seem to want to properly convert between frequency and LSR
> velocity. Regardless of the velocity range of the input spectrum, the
> header always lists:
>
> Alt ref. value  0.00000E+00  wrt pixel    0.00
>
> And then programs such as POSSM interpret the edge of the spectrum to be
> V_LSR=0 km/s. I can doctor this each time, but is there some reason this
> is not being interpreted correctly by UVLOD/FITLD? I think the fits header
> is okay, since other software is able to interpret the velocities
> correctly. A sample full aips header is appended below, and I've included
> as an attachment the fits header.
>
> Lynn
>
> AIPS 1: Image=XHer      (UV)         Filename=XHer        .SCANS .   1
> AIPS 1: Telescope=NRAO_GBT           Receiver=Rcvr1_2
> AIPS 1: Observer=Lynn Mat            User #= 2086
> AIPS 1: Observ. date=21-FEB-2008     Map date=21-FEB-2008
> AIPS 1: # visibilities       361     Sort order  TB
> AIPS 1: Rand axes: RA  DEC  BEAM  TIME1  WEIGHT  SCALE
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
> AIPS 1: COMPLEX      1   1.0000000E+00       1.00  1.0000000E+00    0.00
> AIPS 1: STOKES       2  -1.0000000E+00       1.00 -1.0000000E+00    0.00
> AIPS 1: FREQ       231   1.4207529E+09     169.40  3.8143257E+03    0.00
> AIPS 1: RA           1    16 02 38.095       1.00       3600.000    0.00
> AIPS 1: DEC          1    47 14 30.458       1.00       3600.000    0.00
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Coordinate equinox 2000.00
> AIPS 1: Rest freq   1420.406         Vel type: RADIO   wrt LSR
> AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    0.00
> AIPS 1: Maximum version number of extension files of type HI is   1
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