18.37.2 /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 components, 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.