XMM-Newton serendipitous survey. IV
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https://b2find.eudat.eu/dataset/a4105a1d-174f-516a-915c-a77dcffeef79
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X-ray sources at intermediate fluxes (a few x10^-14^erg/cm^2^/s) with a sky density of ~100deg^-2^ are responsible for a significant fraction of the cosmic X-ray background at...
