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Fig. 4
Optical depth at 9.7 μm versus X-ray hydrogen column density for the Shi et al. (2006) sample (black points) and the optically-thick AGN in the IRAS sample of Wu et al. (2009) (red points). The solid line marks the region where the X-ray NH equals that inferred from τ9.7, assuming a Milky-Way extinction curve.
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