1 UV_SHIFT
        UV_SHIFT

    This task changes the phase tracking center of a UV table, by applying a
    phase shift on the data. The coordinate system can also be rotated using
    the variable ANGLE$. Rotation is easier to  apply  in  UV  tables  since
    rotation  and  Fourier  transform  commute: only the U and V coordinates
    have to be rotated.

2 UVTABLE$
        TASK\FILE "UV table to shift" UVTABLE$

    This the name of UV table  to  be  shifted  and/or  rotated  (input  and
    output)

2 RELATIVE$
        TASK\LOGICAL "Offset  (YES) or Absolute (NO) position" RELATIVE$

    This is a logical indicating whether the new position is relative to the
    current  one  (YES,  offsets  in radians specified) or given in absolute
    coordinates (NO, R.A. and Dec. specified). Absolute mode is  recommended
    for sake of clarity.

2 OFFSET$
        TASK\REAL "Phase center offset (in radians)" OFFSET$[2]

    If the RELATIVE mode is selected, specify the offset (in radians) of the
    new phase tracking  center from the last phase tracking center.

2 RA_CENTER$
        TASK\CHARACTER "R.A. center" RA_CENTER$

    In absolute mode, specify the Right Ascension  in  sexagesimal  notation
    (HH:MM:SS.sss)

2 DEC_CENTER$
        TASK\CHARACTER "Declination center" DEC_CENTER$

    In absolute mode, specify the Declination  of  the  new  phase  tracking
    center in sexagesimal notation (+dd:mm:ss.ss)

2 ANGLE$
        TASK\REAL "Angle" ANGLE$

    The angle (East from North) by which the table must be rotated.  This is
    the  absolute position angle of direction which will become the apparent
    North in the rotated coordinates.

1 END