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Fig. 1.

image

Sky density of sources for the 2623 non-overlapping fields we defined in the 3XMM/PS1 cross-match. Blue circles show the density of optical sources, green triangles the density of X-ray sources (darker shades show a higher density of data points). Top panel: sky density versus the absolute value of the Galactic latitude. Bottom panel: sky density versus exposure time of the XMM-Newton observation.

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