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Output ice field files are written to a fort.93 file that has the same format as the fort.73 pressure file or fort.63 elevation file. This file is only generated when ice fields are used and when global meteorology output is specified for outputting. The settings for global meteorology output are (NOUTGW, TOUTSGW, TOUTFGW, NSPOOLGW) in the fort.15 file.
See fort.93 file format for details.