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Detector gain variations

Bias:  nice bit of amplifier glow, but comes out in the wash


i flat: note the vignetting near the outer 4 detector long edges and the short edges of the detectors either side of the 85 arcsec gaps


i ratio: ratio of September to October monthly master flats, note the 1-5% gain changes of 3 of the detectors in the 2nd row down and also the dark vertical band on the left and bright bar on the right for these outer long detector edges - due to filter positioning differences,


r ratio: same thing for r this time, note again the usual suspects for gain changes and also the beautiful illustration of the difference in scattered light present between these two sets of flats and also in the i-band ones above (different yet again !)