Upper panel: distribution of the detection likelihood values for the 2RXS catalogue (blue) and the 1RXS catalogue (red). The inset shows a zoom to the low-likelihood regime. Lower panel: distribution of count rates for the 2RXS and 1RXS catalogue. Solid and dashed lines denote differential and integral distributions, respectively. The scale for left and right y-axes is identical for all figures with differential and integral distributions.
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