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Fig. 2

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Top: histograms of the number of associations and of the estimate of the number of spurious associations by bin of log 10(LR). Bottom: Reliability histogram by bin of log 10(LR) and its fitted curve. In the example, LRs have been computed according to the SDSS DR7 r magnitude for XMM sources with a systematic error of 0.35 arcsec with a galactic latitude 30° <  |b|  < 45°.

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