Fig. 9.
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Precision (in percent) of the VIS sky flat-field as a function of the number of combined exposures (as scaled by time) and the applied binning. The dotted horizontal magenta line represents the maximum measured variation of the LED flat-fields within the λ range of VIS (Szafraniec et al. 2016). The dashed black horizontal line represents the precision requirement for the calibration lamp flat-fielding correction. See the legend for details.
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