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Hi Matt and Richard, As you have already learned, you do need to rebuild NCO based on netCDF 4.9.0 to take advantage of filters from within NCO. However, NCO itself neither requires nor allows special configure options to support filter invocation. NCO just needs to be rebuilt as normal, on top of netCDF 4.9.0 built as Ed Hartnett specified. The NCO documentation on its new filter and quantization capabilities is at http://nco.sf.net/nco.html#compression Charlie -- Charlie Zender, Earth System Sci. & Computer Sci. University of California, Irvine 949-891-2429 )'(
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