[daip] CLCOR/POLR fails on VLA cont. snapshot dataset

[Michael Rupen]

Dear DAIP,

  running CLCOR to correct the R-L phase offset in standard VLA continuum
(snapshot) observations fails, with the following error message:

  CLCOR1: Task CLCOR  (release of 31DEC99) begins
  CLCOR1: TABKEY: TABLE KEYWORD POLTYPE  NOT FOUND
  CLCOR1: ANTCOR: ERROR 21 FINDING POL. SOLUTION TYPE KEYWORD
  CLCOR1: Purports to die of UNNATURAL causes
  CLCOR1: mithril      31DEC99 TST: Cpu=       0.0  Real=       0

Using version OLD (15APR99) gives the identical error.  Since this is a
fairly standard thing to do, I suspect the error results because I have NOT
run PCAL -- the parallactic angle coverage is very small, and it seemed
silly to try to determine ant. pol'n parameters.  I *would* like to
roughly correct the R-L phase offset however, which doesn't seem
unreasonable, so I hoped CLCOR would work.  Any thoughts?  Is the lack of
PCAL actually the problem, or is this a red herring?

  Thanks,

          Michael Rupen
          mrupen at nrao.edu
          505/835-7248

Inputs to CLCOR:
  AIPS 1: CLCOR     Task which applies various corrections to CL tables.
  AIPS 1: Adverbs         Values            Comments
  AIPS 1: ----------------------------------------------------------------
  AIPS 1: INNAME     '20000803    '          Input UV file name (name)
  AIPS 1: INCLASS    'C BAND'                Input UV file name (class)
  AIPS 1: INSEQ         1                    Input UV file name (seq. #)
  AIPS 1: INDISK        5                    Input UV file disk unit #
  AIPS 1: SOURCES    *all ' '                Source list ' '=>all.
  AIPS 1: STOKES     'L   '                  Stokes type to process
  AIPS 1: SELBAND      -1                    Bandwidth to select (kHz)
  AIPS 1: SELFREQ      -1                    Frequency to select (MHz)
  AIPS 1: FREQID        1                    Freq. ID to select, 0=>all
  AIPS 1: BIF           0                    Lowest IF number 0=>all
  AIPS 1: EIF           0                    Highest IF number 0=>all
  AIPS 1: TIMERANG   *all 0                  Time range to use.
  AIPS 1: ANTENNAS   *all 0                  Antennas to correct.
  AIPS 1: SUBARRAY      0                    Subarray;  0 => 1.
  AIPS 1: GAINVER       3                    CL table version to update
  AIPS 1: OPCODE     'POLR'                  Operation code.
  AIPS 1: CLCORPRM    -40.26       59.97     Parameters (see HELP CLCOR).
  AIPS 1:            *rest 0
  AIPS 1: BADDISK    *all 0                  Disks to aviod for scratch

  Data are on mithril.aoc.nrao.edu, user number 11.  I TASAV'd the data set
  before running CLCOR -- see 20000803.CTASAV.1 for the pre-CLCOR tables.
  The data were loaded with on-line FILLM if that matters (version
  'online').

p.s. These inputs are taken directly from the current AIPS cookbook, p. 4-34.