Fraction of obscured (with HR > −0.4) X-ray AGN versus RC − K colour. Filled circles and the solid line represent sources whose mid-infrared IRAC colours satisfy the Stern et al. (2005) criteria and are assumed to be AGN-dominated in the optical-infrared, while open circles and the dashed line represent sources where the host galaxy is assumed to dominate the optical-infrared flux.
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