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DERIVE Example

          Commands COLLECT and DERIVE are typically used  to  improve  wide-
    bandwidth self-calibration solutions. At NOEMA, a self-calibration solu-
    tion can be computed independently for each of the 4 Wide band UV table.
    Assume these are stored in Wide-'i'-phase-sol.gdf, with i varying from 1
    to 4.
      COLLECT Wide-phase*.gdf Cont-sol.gdf
      DERIVE  Cont-sol.gdf Cont-cgains.uvt
      READ CGAINS Cont-cgains.uvt
      FOR I 1 to 4
        READ UV Wide-'i'.uvt
        APPLY DELAY /FLAG
        WRITE UV Self-Wide-'i'.uvt
      NEXT
    will average the (antenna-based) Phase calibration  solutions  (COLLECT)
    and  compute  the corresponding Baseline-based gains (DERIVE).  The loop
    then applies this better self-calibration solution  to  each  UV  table,
    scaling the Phases according to Frequency.


Gildas manager 2023-06-01