AIPS HELP file for PBPARM in 31DEC26

As of Mon Jun 15 11:25:26 2026

HELP SECTION

PBPARM
Type:  Adverb  (Real array, 7 elements)
Use: PBPARM provides a cutoff for the evaluation of a primary beam
     and optionally provides its parameters:

  PBPARM      Primary beam parameters:
              (1) Lowest beam value to believe: 0 -> often says to
                  ignore the primary beam.  When the beam is required,
                  the default cutoff is task dependent.
              (2) > 0 => Use beam parameters from PBPARM(3)-
                   PBPARM(7)
              (3-7)..For all wavelengths, the beam is described by the
                function:
                   1.0 + X*PBPARM(3)/(10**3) + X*X*PBPARM(4)/(10**7) +
                   X*X*X*PBPARM(5)/(10**10) + X*X*X*X*PBPARM(6)/(10**13)
                   X*X*X*X*X*PBPARM(7)/(10**16)
                where X is (distance from the pointing position in arc
                minutes times the frequency in GHz)**2.  For the VLA,
                these parms are, by default, given by Perley's fits:
                                    (3)    (4)     (5)
                      0.0738 GHz  -0.897  2.71   -0.242
                      0.3275      -0.935  3.23   -0.378
                      1.465       -1.343  6.579  -1.186
                      4.885       -1.372  6.940  -1.309
                      8.435       -1.306  6.253  -1.100
                     14.965       -1.305  6.155  -1.030
                     22.485       -1.417  7.332  -1.352
                     43.315       -1.321  6.185  -0.983
                The defaults for PBPARM(6) and (7) are zero.
Tasks:
   BOXES.........Adds Clean boxes to BOXFILE around sources from a list.
                 Corrects survey fluxes by beam to decide if they
                 should be included.
   FACES.........Makes images of catalog sources for initial
                 calibration.  Corrects survey fluxes by beam to decide
                 if they should be included.
   FLATN.........Re-grid multiple fields into one image incl
                 sensitivity.  Corrects mosaic'd images for beam.
   IMFIT.........Fits Gaussians to portions of an image.  Corrects
                 answers for beam.
   JMFIT.........Fits Gaussians to portions of an image.  Corrects
                 answers for beam.
   LTESS.........Makes mosaic images by linear combination.  Corrects
                 images for primary beam.
   MOMNT.........Calculates images of moments along x-axis (vel, freq,
                 ch).  Cutoff levels are adjusted for the beam.
   PATGN.........Task to create a user specified test or primary-beam
                 pattern.
   PBCOR.........Task to apply or correct an image for a primary beam.
   SAD...........Finds and fits Gaussians to portions of an image.  the
                 answers are corrected by the beam if desired.
   SETFC.........Makes a BOXFILE for input to IMAGR.  Corrects survey
                 fluxes by beam to decide if they should be included.
   SPCOR.........Task to correct an image for a primary beam and
                 spectral index.
   SPIXR.........Fits spectral indexes to each row of an image incl
                 curvature.  Cutoff levels are adjusted fro beam.
   STESS.........Task which finds sensitivity in mosaicing.  Images are
                 corrected for primary beam.
   TVSAD.........Finds and fits Gaussians to portions of an image with
                 interaction.  Answers are corrected for beam.
   TVSPX.........Fits spectral indexes to each image row, allows
                 interactive edit.
   UTESS.........Deconvolves images by maximizing emptiness.
   VTESS.........Deconvolves sets of images by the Maximum Entropy
                 Method.
   XMOM..........Fits one-dimensional moments to each row of an image.
                 Cutoff levels are adjusted fro the primary beam.

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