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Charlie, I've narrowed down the exact problem. It seems that ncap2 can append to an uncompressed file, or write a compressed variable to a new file, but cannot append to a file with compressed variables. I've filed a bug report with details at https://sourceforge.net/p/nco/bugs/111/. -Sourish On 3/25/19 8:31 AM, Charlie Zender wrote: > Souresh, > > See http://nco.sf.net#help for NCO issues. > > FWIW, this command works fine for me with your file: > > ncap2 -L 6 -4 -h -A -s > 'co2_flux_natural=bio_flux_opt+fire_flux_imp+ocn_flux_opt' > guineapig.nc foo.nc > > The -A is superfluous, and perhaps you omitted the output filename. > If not, please move this thread to the site above. > > Charlie
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