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CIN Value

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I get the CIN value from wrfout file with the ncl function wrf_user_getvar(file,"cape_2d",-1). The CIN have always positive values, while with the AFWA diagnostics used in the WRF process the values are always negatives. I thought CIN must be negative, is the CIN given by ncl function is unsigned, or something is wrong?
Thanks in advance for your answers