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Scott / Steve, The SREF grib2 fields on NOAAPORT have WXTP, WXTR, WXTZ, WXTS grids that can generate blank space within the parameter name in gb2_prob in nagrib2. Under "case 2", the parameter name is appended with possible blanks in the upper range due to the format specifier %4d rather than %04d. I changed the sprintf statement: sprintf( cpds, "%04d%4d", (int) lower, (int) upper ); to: sprintf( cpds, "%04d%04d", (int) lower, (int) upper ); I can send you the sample data and the tracking form if needed. Steve -- Steve Chiswell <address@hidden> Unidata