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Name Template: PUB/MISSION/level1a/igsPol/igsPol_YYYY.DDD.HH.MM.UUUU_igs

DDDDay of year
MISSIONMission ID (eight characters or less--champ, champrt, sacc, sacctst, etc)
PUBBase directory for the pub hierarchy
UUUUDuration of file in minutes

GPS pole file from the IGS in IGS format. These files are matched with the IGS GPS orbit files. These files are available from the IGS.