MX

        MX : Make and Clean maps from UV data

    This task combines UV_MAP  and  CLEAN  in  a  single  step.   The  CLEAN
    algorithm  is  similar  to  the  CLARK  method,  but  with  major cycles
    operating directly on the ungridded UV table rather than  in  the  image
    plane.  Accordingly, there is aliasing only of the residuals, not of the
    clean components.

    MX can process all planes of a data  cube  at  the  same  time,  but   a
    separate  list  of  component  will  be  produced  for  each plane.  The
    cleaning cannot be restarted.

    The mapping process is identical to UV_MAP.  It makes a map from UV data
    by  gridding  the  UV  data  using  a convolving function, and then Fast
    Fourier  Transforming  the  individual  channels.   However,  MX  always
    produces  a  single  beam  for  all  channels, thus neglecting frequency
    change between channels.

    MX allows to shift the map center and rotate the image, by shifting  the
    phase  tracking  center  and rotating the UV coordinates of the input UV
    table.

    MX produces several output maps, of name derived from MAP_NAME$,  and  a
    residual output UV table.