DERIVE Example
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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.