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Home Page/Documentation:
http://nco.sf.net (homepage) and http://nco.sf.net/nco.html (documentation)
Repository:
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Used in many E3SM post-processing packages, including E3SM-unified, MPASE3SM_diags, MPAS-Analysis, e3sm2cmip, Zppy, and LIVVkit. The most common NCO uses in these packages are regridding, climatology generation, and timeseries extraction.