[CLEAN\]UV_FIELDS RaVar DecVar [Unit] [/CENTER Ra Dec] /FILE File
Modify the specified File.uvt handling the UV table.
If the option is not present, it would instead modify the current UV da-
ta in IMAGER. However, the READ command prevents to load UV tables that
require the action of the UV_FIELDS command, so in practice, the /FILE
option becomes mandatory.