UV_CHOP

        [CLEAN\]UV_CHOP InputUV KEY OutputUV

      Chop into pieces the input UV table specified by  InputUV  and  place  the
    pieces  in separate files of names OuputUV-1 ... OutputUV-N.  The pieces are
    determined by the keyword KEY:
      DATES   Split the data by observing dates (time does not count, so
              there will be separate files for continuous observations
              around midnight
      FIELDS  Split by pointing/phase directions

    UV_CHOP InputUV FIELDS OutputUV is thus similar to
      UV_MOSAIC InputUv SPLIT OutputUV
    except that is produces degenerate 1-field mosaics instead of  simple  inde-
    pendent single-fields.