SOLVE PHASE

        CLIC\SOLVE PHASE [/PLOT] [/BREAK kind time [kind time ...]]
        [/POLYNOMIAL degree] [/WEIGHT]

    *** THIS HELP HAS NOT BEEN UPDATED FOR THE NGRX ***

    This will fit a mathematical function into the measured  phases  of  the
    sources  in  the current index (presumably calibrators).  This data must
    have been selected and plotted in axes : SET X TIME and SET Y PHASE  for
    the  baselines and bands of interest, specified by the corresponding SET
    commands.  Phases should be continuous (SET PHASE CONTINUOUS). The cali-
    bration function is kept in memory. Command STORE should be used next to
    store this function in the header of source observations, after a change
    in the index to select the appropriate scans.

    SOLVE  PHASE  internally  and  temporarily resets SET PHASE to ABSOLUTE.
    The INTERNAL|EXTERNAL mode is kept to allow determining a phase curve on
    top of an external receiver reference.

    In  antenna mode (selected by SET AMPLITUDE ANTENNA), the averaged phase
    and amplitude closures are computed, as well as  their  standard  devia-
    tions.  The  phase closures should be close to zero, while the amplitude
    closures should be close to 100%.

    Option /PLOT will plot the fitted curve over the data.

    Fitted curves may be of two kinds:

      - Cubic splines (the default).  By default knots are regularly  spaced
        with  an  interval between knots set by the SET STEP command.  Addi-
        tional knots may be introduced with the  option  "/BREAK  kind  time
        [kind  time  ...]"   which  introduces  a  break at abscissa 'time';
        'kind' is an integer in the range 0-3; 0 means that a  discontinuity
        will  be present, 1 that the first derivative will be discontinuous,
        and so on.  Several breaks may be introduced. The program  will  de-
        tect  an  error  if  too many breaks are introduced, compared to the
        density of data points.
      - Polynomial curves may be used instead.   For  this  the  option  is:
        /POLYNOMIAL  [degree]  indicating  the degree of the polynomial (de-
        fault 0).

    Normally the data points are all assigned the same weight for  the  fit.
    With option /WEIGHT, the data points are weighted according to their er-
    rors.