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


    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-

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