Fig. 6


Top: example of a source that is considered as a correct detection, i.e. the source flag is set to zero. The broad-band image is shown. The object is identified as white dwarf WD 1501+663. Bottom: example of an uncertain detection (number 167), located to the lower left of the bright central source (number 164). It is flagged and marked in the image with a cyan cross. Again the broad-band image is shown.

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