Fig. 5
Distribution of position-error-normalised offsets between 3XMM-DR5 X-ray sources and SDSS quasar counterparts (red histogram). The expected Rayleigh distribution is overlaid (black). The XMM position errors are as provided in the 3XMM catalogues (i.e. unadjusted, with no scaling or systematic included). Also shown are similar histograms for data from EPIC off-axis angles, θ, in the ranges θ< 5′ (blue), 5′ ≤ θ< 10′ (green) and 10′ ≤ θ< 15′ (grey). The data are normalised to unit area.
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