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Creates in Fileout a sorted copy of the UV data found in FileIn. Key can be The Key can be TIME for Time-Baseline ordering, BASE for Baseline-Time ordering, or FIELDS for Mosaics. TIME ordering is required for efficient operation of the time averaging command UV_TIME.
The command compares the file size to the available RAM memory (more specifically the size indicated by the logical name SPACE_GILDAS) to decide whether the operation can be done in Memory only or needs intermediate files to perform the sorting.