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I am not sure I completely understand you problem. The values you show Z_ISO = -9.99000009817369e+20, [ . . . elided . . .] are not coming from the _Fillvalue, otherwise they would show as '_'. Are you saying that ncdump is incorrectly using the Fillvalue when it should be using the actual value? =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: DHW-277522 Department: Support netCDF Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.