Top panel: IRAC color–color plot of the early-type galaxies in HCGs (black open triangles) and a sample of field ellipticals (blue filled circles). Bottom panel: the histograms of the log[S5.8/S3.6] color of the two samples. The early-type galaxies in the groups are marked with a black line (left axis), while the field ellipticals are presented in blue (right axis).
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