overlapping files report different values

The sgp5mwravgB5.c1 data file for this day was split into
two files (both partial days).  The first file contains
data for 990913.145500-990913.170000.  The second file
contains data for 990913.170000-990913.173000.  The two
files report different values the the 170000 time stamp.

Do not use the 170000 record from either file 
in your analysis.  Use the remainder of the data
from this day with caution.

• Number of contiguous periods in averaging interval with water on Teflon window(water_flag_periods)
• base time in epoch(base_time)
• Fraction of data in averaging interval flagged by Dynamic Linear Model as poten(dlm_flag_fraction)
• Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)
• Mean 23.8 GHz sky brightness temperature(tbsky23)
• North Latitude(lat)
• Total water vapor along LOS path(vap)
• Mean 31.4 GHz sky brightness temperature(tbsky31)
• Standard deviation about the mean for the total water vapor amount(vap_sdev)
• Number of data points averaged for 23tbsky, 31tbsky, vap & liq(num_obs)
• Number of contiguous periods in averaging interval flagged by Dynamic Linear Mo(dlm_flag_periods)
• -180.0 - +180.0(alt)
• Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
• IR Brightness Temperature(ir_temp)
• 31.4 GHz sky brightness temperature(31tbsky)
• 23.8 GHz sky brightness temperature(23tbsky)
• Number of data points averaged for ir_temp(num_obs_ir)
• Number of points included in the ir_temp ensemble(num_obs_irt)
• lon(lon)
• Standard deviation about the mean for the 23.8 GHz sky brightness temperature(tbsky23_sdev)
• Standard deviation about the mean for the total liquid water amount(liq_sdev)
• Time offset from base_time(time_offset)
• Averaged total liquid water along LOS path(liq)
• Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)