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Others have probably explained that the underscore is a convenient visual stand-in for the number in the _FillValue attribute. ncks will print netCDF datasets with the actual number rather than an underscore with the --no_blank option, e.g., ncks --no_blank in.nc # http://nco.sf.net/nco.html#no_blank Followup as per http://nco.sf.net#help HTH, Charlie -- Charlie Zender, Earth System Sci. & Computer Sci. University of California, Irvine 949-891-2429 )'(
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