LET Behind Level 1 sectored Calibration database.
For each row:
	The timestamp in column 1 is the END of the period
	for which the calibration file in column 2 is valid.
BEGIN
2006-11-16T23:39:24.875	LET_Level1_sectored_factors_behind_000.txt
2006-11-17T21:44:13.125	LET_Level1_sectored_factors_behind_002.txt
2006-12-29T16:54:00.000	LET_Level1_sectored_factors_behind_000.txt
2007-03-29T15:46:32.500	LET_Level1_sectored_factors_behind_001.txt
2010-11-22T17:01:07.000	LET_Level1_sectored_factors_behind_003.txt
2037-01-01T00:00:00.000	LET_Level1_sectored_factors_behind_004.txt
ENDENDENDENDENDENDENDEN	ENDENDENDENDENDENDENDENDENDENDEND