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Fig. 3.

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Illustration of the star subtraction. Left: original r-band image. Center: star models using three Ferrers profiles (see text for more details). Right: residual image after subtracting the star models from the r-band image. The colour scale is the same in all panels. For reference, 535 ADU is 21.53 mag and 1535 ADU is 20.39 mag.

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