Left: u − r color vs. absolute r-band magnitude (M_r) for COMP2CAT, FRICAT, and FRIICAT hosts (blue dots, black squares, and red crosses). The dashed line separates the blue ETG from the red sequence, following the definition published by Schawinski et al. (2009). Right: WISE mid-IR colors of COMP2CAT, FRICAT, and FRIICAT hosts with the same color-coding as in the Fig. 14. The blue cross in the bottom right corner of the plot represents the average error on the colors.