Calibration Access and Data Handbook

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Stacking many spectra of smooth continuum sources over the course of the mission has revealed that the average response of some columns is significantly lower than those of immediate neighbours, leading to their designation as cool. These small defects are only detectable in spectra of high statistical weight but could be mistaken for weak absorption lines of cosmic origin. The SAS can be instructed to discard these cool pixels in the same way as it does more obviously bad pixels.

Michael Smith 2011-09-20