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Question about CODIAC ETA files

The answer to your question is that gempak files are not ASCII files and should not be concatenated using cat. It will probably corrupt the header infomation and conflict the way the gempak library to read the infomation from this file. The easiest way for you is to ftp all the grib version files, concatenate them and pipe them to the dcgrib2 decoder. Then GEMPAK will be able to recognize this file. If you have any problem to find the dcgrib2 decoder you can use find command to locate it, it may be under GEMPAK5.6/bin/irix/dcgrib2 depending on the setting of your GEMPAK software. Let me know if you have any problem.