STORE POLMODEL

        CLIC\STORE POLMODEL alpha(I) alpha(p) RM [alpha(V)]
        CLIC\STORE POLMODEL

    Store source-polarization model coefficients in the headers of every ob-
    servation in the current index. Select  the  intended  calibrator  scans
    with  FIND  first.  The usual writable input/output file setup for STORE
    commands is required. Visibility data and reference I, Q,  U,  V  values
    are not changed.

    The STOKES_SPIDX vector has the following meaning:
      1  alpha(I): spectral index of total intensity I
      2  alpha(p): spectral index of p = sqrt(Q**2+U**2)/I
      3  RM: rotation measure in rad/m**2
      4  alpha(V): spectral index of V, reserved for future use

    Any supplied argument may be "=" to preserve that coefficient separately
    in each observation. If alpha(I) is "=", both element 1 and scalar SPIDX
    are preserved. An explicitly supplied alpha(I) updates both. If alpha(V)
    is omitted, each observation's existing fourth element is preserved.

    With no arguments, copy all four elements of  the  current  STOKES_SPIDX
    vector  to  every  observation  in the index, synchronizing scalar SPIDX
    with its first element. Supplied coefficients must  be  finite  numbers.
    Storing  a model does not enable its use; select SET STOKES LEAKAGE FRE-
    QUENCY to activate source-polarization removal with  frequency  scaling.
    See SET STOKES for the reference frequency and model equations.

    For example:
      STORE POLMODEL -0.5 0.2 100000
      STORE POLMODEL = 0.2 100000 =
      STORE POLMODEL

    The  second  example preserves the stored I and V spectral indices while
    updating alpha(p) and RM.