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HORVISCUV computes the contributions from the horizontal viscosity terms of
equations (58) and (59) and stores these in
the arrays C3U and C3V using the formulation (42) if VISCPOM is false.
HORVISCUVPOM is called if VISCPOM is true and then the formulations
(43) and (44) are applied.

Helge Avlesen
2004-05-10