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Jose, The error you are getting is generated because the header of the file is either damaged, or incorrect for some reason. When a program attempts to open a file, it reads the file header information through data management library routines to learn about what is in the data set. In the file you provided, the information in the header has values which GEMPAK recognizes are bad values, and therefore exits with the FL -4 message. Some possibilities, are: 1) if you transfered the file by ftp, you did not do so in binary mode This is very common if you forget to type "bin" in the ftp session. 2) multiple programs tried to write to the same file simultaneously which is mostly likely for ealtime data if something gets fouled up by a decoder. 3) The data which was put into the file exceeded realistic sizes. Did you create the data file, or obtain it elsewhere? Can you retrieve the original data or redownload the file? Any information you can provide can help determine where your file got corrupted. Also, you sent this message incorrectly to someone else at unidata who forwarded it to me. Please direct messages to address@hidden or address@hidden Steve Chiswell On Wed, 2004-06-02 at 14:55, Jose L Salazar wrote: > Hello Steve, > I am sorry to bother you again. I just wanted to let you know I had > been using Gempak with no problem and it's been a great help. > Only today I encountered some difficulty. > Unfortunately, I am getting some errors when I am trying to decode a > set of sounding files using the SNLIST application. > [fl -4] cannot read file... > [sn -2] File /.... could not be opened > My question is : Are these errors produced because of the settings and > structure within the file itself or something else?. There is no > problems with the permissions since other set of files worked fine. > Attached is a file in case you would want to try to run it . > Thanks a lot for your help and I appreciate your time. > -- > Jose Luis Salazar > Data Sounding Technologist > NOAA/NESDIS Soundings Development Team > Suitland Federal Building, FOB# 4 Room 3206 > Fax : 301-457-5171 > E-mail: address@hidden > >