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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 -- Charlie Zender, Earth System Sci. & Computer Sci. University of California, Irvine 949-891-2429 )'(
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