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1735 photometric redshifts for X-ray sources detected by XMM-Newton across the 2 square degree COSMOS field. The catalog, released by NASA HEASARC in 2011, achieved an accuracy sigma[Delta-z/(1+z_spec)] ~ 0.015 with 5.8% outliers by using a large spectroscopic training set and deep H-band photometry. The study demonstrates how assumptions about source nature and the depth of available photometric bands influence redshift accuracy for active galactic nuclei.
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