Fig. 1
Part of the field around SDSS J1206+4332. It is a combination of 29 frames taken at the 1.2-m Mercator telescope with a seeing and an ellipticity ≤ 0.12. The stars used to model the PSF are labelled 1 to 4. In case one of these stars did not have sufficient quality, three other stars labelled 5 to 7 were used. North is up and east is left.
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