AIPS HELP file for SPECURVE in 31DEC26

As of Sat Jan 24 11:24:46 2026

HELP SECTION

SPECURVE
Type: Adverb (Real array(3))
Use:  Spectral index curvature defined so that the flux density goes
      as

            log(T(f)/T(f0) = S * log(f/f0) + C(1) * (log(f/f0))^2
               + C(2) * (log(f/f0))^3 + C(3) * (log(f/f0))^4

      where S is SPECINDEX and C is SPECURVE, f0 is 1 GHz for
      simplicity, and all logs are base 10.  It is unlikely for you to
      have reliable values for SPECURV(3); SETJY uses only through
      SPECURVE(2) for the basic flux calibration sources.

Tasks:
   BLCHN.........Compute closure offset corrections on a channel-by-
                 channel basis.  Curvature value with f0 1 GHz.
   BPASS.........Computes spectral bandpass correction table.
                 SPECURVE is used to remove curvature from the derived
                 bandpass amplitude spectrum.  f0 is the frequency in
                 the UV data set header and is independent of IF and
                 channel.
   CPASS.........Computes polynomial spectral bandpass correction table
                 Curvature value with f0 1 GHz.
   EVAUV.........Subtracts & divides a model into UV data, does
                 statistics on results.  Spectral curvature if using
                 SMODEL with f0 the header frequency.
   SETJY.........Task to enter source info into source (SU) table.
                 Curvature value with f0 1 GHz.
   SOUSP.........Fits SPECINDX and SPECURVE to the fluxes in an SU table
                 returning the values for input to BPASS.et al.

EXPLAIN SECTION