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Tom, Gempak uses the value -9999.0 as a missing data value. If you can modify your data files to use that value instead of -99, then you will be all set. Steve Chiswell Unidata User SUpport address@hidden On Thu, 3 Jun 1999, Tom Szymkiewicz wrote: > Hi, > Thank you for your help on x-windows. I have another question for > which I haven't been able to find an answer through old support > e-mails. If my data has some missing data flagged as say -99, how does > gempak handle that? Is there a way to tell gempak what values to > treat as missing data? > I'd appreciate your help. > Tom. > >