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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 deviations.
  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.  Addition-
      al  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 detect 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: /POLY-
      NOMIAL [degree] indicating the degree of the polynomial (default 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.


Gildas manager 2011-09-07