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Fig. 9

Fig. 9 Refer to the following caption and surrounding text.

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Mean flux per pixel in the dichroic (left) and filter (right) ghost, calculated from the smoothed radial profiles as described in Sects. 4.2 and 5.2. The minimum brightness for masking is thus determined for each filter by the requirement that the ghost must contribute less than 0.0866 e pixel−1.

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