This is the maximum number of components the program will accept to sub-
tract. Once it has been reached, the program starts the restoration
phase.
If 0, the program will guess a number, based on the image size and maxi-
mum signal-to-noise ratio, and specified residual level CLEAN_ARES
and/or CLEAN_FRES.
Short form is NITER.
This may be overseded by the /NITER option which imposes a limit per
plane through an array of values.