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Fig. 19

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Difference of second moments of stars to the average (over 1 CCD), as a function of peak flux. This is measured on a small set of r-band frames taken at low Galactic latitude, which have < σIQ > ≃ 1.8 pixel. From vanishing to almost saturating stars, the apparent size of stars seem to vary essentially linearly with peak flux by about 0.5%.

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