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Discard (i.e. remove from the memory and the list of known variables) the specified buffer(s). Only the most important buffers can be discarded. This may be needed in Memory hungry situations.
DISCARD *
will discard all image-like buffers:
BEAM, CCT, CLEAN, CONTINUUM, DIRTY, MASK, PRIMARY,
RESIDUAL, SHORT, SINGLEDISH, SKY
DISCARD UV*
will discard all UV-like buffers
UV, UVCONT, UVSELF, UV_MODEL