UV_RESTORE /SPEED

        [CLEAN\]UV_RESTORE /SPEED Mode [/COPY]

    Create  a  Clean  image from the current UV data set and the Clean Component
    list, using the specified Mode to remove the Clean Components before imaging
    the residuals.

    The argument Mode may be one of the following keyword:
    AUTO    Automatically select the "fastest" method, according to the
          current number of Visibilities and Clean components.
    FFT     Subtract Clean Components by FFT and interpolation onto
          individual visibilities.
    PRECIS  Subtract the Clean Components by simple Sin/Cos phase terms
          for each visibility
    The PRECIS mode is faster for a small number of visibilities and Clean  com-
    ponents, while the FFT mode is faster for large ones.

    Instead  of  the  above  keywords, Mode may also be a number which specifies
    when the AUTO mode should switch from PRECIS mode to FFT mode.   The default
    number to control the AUTO mode is 200 Millions (product of  the  number  of
    visibilities and average number of Clean components per channel). This value
    is  "sticky":  if  changed  by /SPEED, the new values is retained until next
    change.