Fig. 2

image

Example for a source count image of sky field 930304 in the way it is used for source detection. For the colour representation in this and all following images the ESO/MIDAS colour table heat is used with linear intensity scaling. The cyan solid lines confine the 6.4° × 6.4° field and the scan direction is marked with the yellow line through the centre of the field. 2RXS sources are indicated with green circles. Detections that were manually flagged as being uncertain (see Sect. 3) are marked with cyan crosses. Coordinates refer to the image centre, the exposure time is the median over the whole image.

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