After the completion of O2, several identified systematic errors inherent to previous releases of calibrated detector output, h(t), (aka C00 and C01) were identified then subsequently removed from the calibration model and the latest (re)calibrated detector output release (namely, C02). As such, these systematic errors have been also removed from the uncertainty budget. The results are summarized here.
Original Source material: https://alog.ligo-la.caltech.edu/EVNT/index.php?callRep=12056 https://alog.ligo-la.caltech.edu/EVNT/index.php?callRep=12055