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Each of these command line flags are optional. From the man page at http://www.unidata.ucar.edu/cgi-bin/gempak/manual/decoders_index?dcmetr , if you wish to use these options, they are specified on the command line in a way similar to that of the -c yymmdd/hhnn, for example: dcmetr -c YYMMDD/HHNN -b 12 -s stns.tbl -p parm.lst output_file < input_file This would set the "current time" to YYMMDD/HHNN, set the "number of hours to decoder prior to 'current' time" to 12, set the station table to a file "stns.tbl" and the parameter packing list to a file "parm.lst". -Michael > Thanks for you help. This did work. However, could you still let me know > where the 'parameter packing table', 'station table', etc. are specified? > > Thanks for your help. > > Steve > Ticket Details =================== Ticket ID: CDH-409468 Department: Support GEMPAK Priority: High Status: Open