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This is an integer specifying the minimum number of Clean components before testing if Cleaning has converged. The convergence is criterium is a comparison of the cumulative flux evolution separated by CLEAN_NKEEP components. If th
IF CLEAN_NKEEP is 0, CLEAN will ignore this convergence criterium, and continue clean until the CLEAN_NITER, CLEAN_ARES or CLEAN_FRES criteria indicate to stop.
With CLEAN_NKEEP > 0, CLEAN will explore the stability of the total clean flux over the last CLEAN_NKEEP iterations. For a positive (resp. negative) source, if the Clean flux becomes smaller (resp. larger) than the Clean flux CLEAN_NKEEP iterations earlier, CLEAN will stop.
Using CLEAN_NKEEP about 70 is a reasonable value. Some special cases (faint extended sources) may require larger values of CLEAN_NKEEP.