Keywords: sic-gdfv2

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## UV data format usage restrictions

The Gildas UV tables signatures (12 first characters of the binary file) `GILDAS_UVDAT` and `GILDAS_UVSOR` are not used anymore6. The initialization by `GILDAS_NULL` sets the generic signature `GILDAS_UVFIL` instead.

To simplify our life, we have imposed the following constraints

- There must be 7 leading `daps` before the visibilities. These `daps` have to be in sequence: `code_uvt_u, _v, _w` or `_scan, _date, _time _anti, _antj`. This default ordering of ``mandatory'' `daps` follows the GDFV1 convention.
- The 7 leading `daps` must be real.
- Usage of `real(8)` `daps` is restricted to `code_uvt_ra, code_uvt_dec`.