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Fig. 6

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Cumulative numbers of correlations between the X-ray detections and the GSC2.2 catalogue (upper panel) or the 2MASS catalogue (lower panel). The thick curves represent the observed numbers, the short dashed curves show the best fits and the dotted and long dashed curves correspond to the spurious and real number of correlations respectively. The vertical dot-dashed line identifies the optimal correlation radius at .

This figure is made of several images, please see below:

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