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Constraints on the torus from X-ray
AGN population studies
Full Bayesian spectral analysis                                      	
Non-parametric luminosity function & NH distribution
Johannes Buchner (MPE/PUC)
A. Georgakakis, K. Nandra, 
M. Brightman, M-L Menzel, Z. Liu, 
L-T. Hsu, M. Salvato, C. Rangel, J. Aird, A. Merloni and N. Ross
Buchner et al. (2015)
Fraction of Obscured
Averaged over cosmic time, LX>1042 erg/s
AGN: 38+8-7%
Fraction of Compton-thick
AGN: 77+4-5%