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Package ``SMOOTH'' provides MITgcm with horizontal smoothing
operators, including the method of Weaver and Courtier (2001).
http://mitgcm.org/~gforget/pdfs/weavercourtier01.pdf

Some discussion of this package is under this MITgcm-support thread:
http://mitgcm.org/pipermail/mitgcm-support/2015-April/009874.html

More to come ...
