# cpuhist.XXXXXX format
#
# column 1:  time difference in msec (from -1000...+1000)
# column 2:  TrueTime 1PPS vs. CPU time
# column 3:  TTET vs. CPU time at TRG pulse
#
# If column 3 is empty (all 0) then there were no spill trigger events
# during the observation period.