AIPS HELP file for BWSMEAR in 31DEC25

As of Wed Dec 11 6:40:00 2024

HELP SECTION

BWSMEAR
Type: Adverb  (scalar)
Use:  To specify how much correction to make for bandwidth smearing.
      For model fitting, the bandwidth smearing function is taken to be
      a Gaussian in the radial direction of FWHM = BWSMEAR times the
      radius from the original pointing direction.  This is really not
      the correct function to use.  The bandwidth shape itself should be
      used.  But that varies from antenna to antenna and makes the Clean
      beam convolved with that shape into something other than a
      Gaussian.  Give the task something like the bandwidth divided by
      the center frequency.  The fitting tasks smear the basic Clean
      beam with this function when the Clean beam is used for the
      initial guess of the compnent widths and when the Clean beam is
      used for deconvolving the fit widths to estimate the true widths.

Null value: <= 0
      Taken to mean do no correction.

Tasks:
   IMFIT.....Fits up to four Gaussians
   JMFIT.....Fits up to four Gaussians
   SAD.......Fits up to 4000 Gaussians in a subimage, finding the source
             regions itself and attempting simple and multiple-Gaussian
             fits to each region.
   TVSAD.....Finds and fits Gaussians to portions of an image with
             interaction.  Basically SAD with user interaction whenever
             there is difficulty fitting an island.

EXPLAIN SECTION