Distributions of absorbed power law (PL) model parameters. Left: distribution of host galaxy column density measured using the baseline, absorbed power law model. There is a clear primary peak at NH_z ≃ 10²⁰ cm⁻², with a secondary peak at NH_z ≃ 10^22.5 cm⁻². Right: as top left, but shown for the photon index. There is a clear peak at Γ ≃ 2.0, and a second cluster of objects with an unusually flat Γ of ∼1.4.