Effective radius mass-size relation. Left panel: our effective radius values (derived from 3.6 μm imaging) plotted against stellar mass, with a linear fit to ETGs with masses > 10^10.7 ℳ_⊙ shown in black and the z = 0.25 ETG mass-size relation from Newman et al. (2012) shown in green (labeled N12). Right panel: the same as the left, but here R_eff has been adjusted by a factor of to adjust the values to those measured using circular apertures, following Shen et al. (2003), whose fit is overplotted in blue (labeled S03). ETG data points are multicolored (with dwarfs in cyan), while LTGs are shown in gray.