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Fig. 2


IRAC colour–colour diagram for the entire IRAC sample (plotted as a surface grey map) and for the cross-correlation sample: blue circles and red triangles represent IR power-law and IR non-power-law galaxies according to Donley et al. (2012), respectively. The filled and empty symbols denote absorbed and unabsorbed sources, respectively. The symbols change in size to denote different ranges of X-ray luminosity. The solid line shows the revised IRAC-criteria wedge by Donley et al. (2012).

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