Fix issue with missing '0' in HC calibration IOVs.
Used the calibration found for fill 4540 in 2015 (calibration is pretty stable across 2015, and almost no ee's before this fill so makes sense to assume its calibration values)
Used the calibration found for fill 4540 in 2015 (calibration is pretty stable across 2015, and almost no ee's before this fill so makes sense to assume its calibration values)