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Robust and complete Demographics of Active Galactic Nuclei Data: ~2000 2-10keV detected AGN: CDFS, AEGIS-XD, C-COSMOS, XMM-XXL (20deg²) Full Bayesian spectral analysis Buchner+14 Non-parametric luminosity-function & NH distribution Buchner+15 Johannes Buchner (MPE) Antonis Georgakakis, Kirpal Nandra, Murray Brightman, Marie-Luise Menzel, Zhu Liu, Li-Ting Hsu, Mara Salvato, Cyprian Rangel, James Aird, Andrea Merloni and Nicholas Ross http://arxiv.org/abs/1501.02805 Fraction of Obscured NH>10²²cm-2 LX>1042 erg/s Averaged over cosmic time AGN: 38+8-7% Fraction of Compton-thick AGN: 77+4-5%