Fig. A.1

image

Sub-images used in our detection scheme: the whole frame corresponds to a full 6.4° × 6.4° RASS field, the blue area denotes the unique region (rectangle in equatorial coordinates, here for field 930507p). The red lines illustrate the unique areas for each sub-image, while the dashed lines show the overlap among the sub-images. All sub-images have the same size. sky_pix units are 0.5′′. The sub-image number USKY as well as the (X_SKY,Y_SKY) coordinate values for each detection are stored in the catalogue. For details see text.

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