Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
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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