# THE DATA FROM THE PIONEER VENUS LIR EXPERIMENT ARE GIVEN IN THREE FILES
# (1) THE PRE-ENTRY DATA
# (2) THE DESCENT DATA AND
# (3) THE ON-BOARD CALIBRATION DATA.

# THE FILES ARE ARRANGED IN FIVE COLUMNS. FIRST IS THE GROUND RECEIVED TIME
# (GRT) IN HOURS, MINUTES AND SECONDS. THIS CAN BE RELATED TO ALTITUDE,
# PRESSURE, TEMPERATURE BY USE OF THE LAS FILE. THE UNITS FOR THE NEXT FOUR
# FILES ARE WATTS PER SQUARE METER. THE SECOND COLUMN, LABELED "A", IS FOR
# THE 3 TO 250 MICROMETER SPECTRAL BANDPASS. THE THIRD COLUMN, LABELED "B",
# IS FOR THE 6 TO 7 MICROMETER SPECTRAL BANDPASS. THE FOURTH COLUMN, LABELED
# "C", IS FOR THE 7 TO 8 MICROMETER SPECTRAL BANDPASS. THE FIFTH COLUMN,
# LABELED "D", IS FOR THE 8 TO 9 MICROMETER SPECTRAL BANDPASS.

# A FACTOR OF "PI", WHICH HAD BEEN INCORRECTLY APPLIED, HAS BEEN REMOVED FROM
# THESE DATA, AND THE DATA HAVE HAD INSTRUMENT ELECTRONIC OFFSET CORRECTIONS                             
# APPLIED.
#
# THE FIRST DATA RECEIVED AFTER AN INSTRUMENT CALIBRATION CYCLE IS DISTORTED
# BY A "MEMORY" EFFECT AND SHOULD BE DISCARDED OR USED WITH EXTREME CAUTION.
# THE EFFECT IS MOST EASILY SEEN IN FILE NUMBER ONE, THE PRE-ENTRY DATA, AT
# THE FOLLOWING TIMES 18:35:53, 18:39:05, AND 18:42:17.

# THE ON-BOARD CALIBRATION DATA, FILE NUMBER THREE, INDICATE AN INCREASING
# SIGNAL DURING THE DESCENT PHASE OF THE MISSION.  THIS WAS DUE TO INCREASING
# PROBE BUS-VOLTAGE; THE CALIBRATION SYSTEM WAS NOT ON REGULATED POWER.  THIS
# TYPE OF CHANGE WAS OBSERVED DURING CALIBRATION OF THE INSTRUMENT.  THE LAST
# CALIBRATION CYCLE ENDED 2 MINUTES, 18 SECONDS PRIOR TO IMPACT ON VENUS' SURFACE.

# FILE NUMBER THREE
# LIR ON-BOARD CALIBRATION DATA
# GRT,A,B,C,D