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Name Template: PUB/MISSION/level0/igsHrf/YYYY.DDD.HH/igsHrf_FFFF.YYYY.DDD.HH.MM.UUUU_rnx.Z

DDDDay of year
FFFFFiducial site ID
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

IGS high rate (1 second) ground station GPS data. Stored in Hatanka compressed, unix compressed RINEX files. These are currently 15 minute files.