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Fig. 2
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Upper panel: percentage of 4XMM-DR11 sources with an optical or near-IR counterpart as a function of X-ray flux in the soft (0.5–2 keV, blue) and the full band (0.2–12 keV, red). Lower panel: flux distributions in the soft band and full bands of the 4XMM-DR11 and 4XMM-DES-VHS samples.
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