MAP_SIZE

      MAP_SIZE[2]      Integer

    Number  of  pixels  in  X and Y. It should preferentially be a power of two,
    (although  this  is  not   strictly   required)   to   speed-up   the   FFT.
    MAP_SIZE*MAP_CELL  should  be  at  least twice the size of the field-of-view
    (primary beam size for a single field). Enter 0,0 to let the command find  a
    sensible map size.

    MAP_SIZE is not used if MAP_FIELD is non zero.

    Odd values are forbidden.

    Default is 0,0, i.e. UV_MAP will guess the most appropriate values which de-
    pend on MAP_ROUNDING and MAP_POWER.