Spitzer/IRAC mid-IR color diagram. Observed AGNs populate the area in between the black lines at [3.6] − [4.5] ≳ 0.3 (Stern et al. 2005). Colors derived from the AGN library populate this area. Type I sources with viewing angle <60° are shown as red circles and over-plotted are type II sources (> 60°) as blue circles .
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