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Ananna, Tonima ,  Treister, Ezequiel ,  Urry, C. Megan ,  Ricci, Claudio ,  Hickox, R. C. ,  Padmanabhan, Nikhil ,  Marchesi, Stefano ,  Kirkpatrick, Allison ,  [Accretion History of AGNs. II. Constraints on AGN Spectral Parameters Using the Cosmic X-Ray Background, Accretion History of AGNs. II. Constraints on AGN Spectral Parameters Using the Cosmic X-Ray Background] ,  Accretion History of AGNs. II. Constraints on AGN Spectral Parameters Using the Cosmic X-Ray Background