This is the trending plot for the ISAAC twilight flat QC parameters of the SW-arm

These plots describe:
The so-called odd-even-column-effect (OE). The effect is monitored via two different QC parameters per filter and per quadrant. The definition of the parameters is explained on the QC twflat page. There had been only a very few events during the Hawaii detector life time when the QC1 parameters reached and exceeded the per-cent level.

Fig.1. Odd columns mean parameter upper left quadrant of the detector.
Fig.2. Odd columns mean parameter upper right quadrant of the detector.
Fig.5. Odd columns mean parameter lower left quadrant of the detector.
Fig.6. Odd columns mean parameter lower right quadrant of the detector.
Fig.3. Odd columns stdev parameter upper left quadrant of the detector.
Fig.4. Odd columns stdev parameter upper right quadrant of the detector.
Fig.7. Odd columns stdev parameter lower left quadrant of the detector.
Fig.8. Odd columns stdev parameter lower right quadrant of the detector.

This QC1 parameters are sensitive to changes in the linearity of odd and even columns separately. Find more information about ISAAC QC parameters derived from twilight flats here.