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Name Template: PUB/MISSION/level1a/igsOrb/igsOrb_YYYY.DDD.HH.MM.UUUU_sp3

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

GPS orbit file from the IGS in SP3 format.