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Fig. 8.

image

Mid-infrared diagnostic by Lacy et al. (2004, 2007). Dots: SERVS-SWIRE reference population. Diamonds: CDF-S3 variable sources. Squares: CDF-S4 variable sources. Color bar: stellarity index from 0 (red) for galaxies to 1 (blue) for star-like sources. Red dashed lines: Lacy et al. (2007) AGN selection criteria. Black dashed lines: Donley et al. (2012) AGN selection criteria.

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