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Linearity correction issues
This in principle involves solving 32 million independent non-linear equations. However, current measurements from dome flat sequences indicate that the system is linear to <1% up to the saturation regime ie.~40K counts/pixel (though other artefacts such as channel boundaries appear at ~30K counts/pixel). Although it is feasible to measure and correct CDS mode non-linearity, it would add ~30s extra CPU overhead to the data processing per MEF and is thus not carried out.