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This is the minimal fraction of the peak flux in the dirty map that the program will consider as significant. Alternatively, an absolute threshold can be specified using CLEAN_ARES. Once this level has been reached the program stops subtracting, and starts the restoration phase. This parameter is normalized to 1 (neither in % nor in db). It should usually be of the order of magnitude of the inverse of the expected dynamic range of the intensity.
If 0, CLEAN_ARES will be used instead. If all of CLEAN_NITER, CLEAN_ARES and CLEAN_FRES are 0, an absolute residual equal to the noise level will be used for CLEAN_ARES.
Short form is FRES.