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Motivation 20-40% Compton-thick AGN 75% AGN are obscured (X-ray NH > 1022cm-2) Importance of galaxy-scale obscuration? Goal: z=0.5-3 upper limit 1e46 ~75% ~40% 1e42 Fraction obscured Accretion Luminosity [erg/s] Maiolino&Rieke95, Matt00, Goulding&Alexander09