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Description of shea_util.ncl functions

shea_util.ncl is a library of user-contributed functions written in NCL. Originally, these functions were written by Dennis Shea for personal use. However, other users found the functionality useful and they are now distributed with NCL.

Over time, others have written functions that have been included in shea_util.ncl for convenience. Note that some of the functionality of the shea_util.ncl functions has been included in the gsn special resources. It requires that the gsn_code.ncl, gsn_csm.ncl and contributed.ncl libraries be loaded prior to loading shea_util.ncl.