2XMMi/SDSS DR7 cross-correlation
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https://b2find.eudat.eu/dataset/2d59ea9a-77d2-5e07-b71d-7487959740ee
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The Survey Science Centre of the XMM-Newton satellite released the first incremental version of the 2XMM catalogue in August 2008. Containing more than 220000 X-ray sources, the...
