19.5.1 Example

Commands COLLECT and DERIVE are typically used to improve wide-bandwidth self-calibration solutions. At NOEMA, a self-calibration solution 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.