Effective radius of a de Vaucouleurs fit, R_deV, in the r-band as a function of stellar mass (h = 0.7). The symbols for the galaxies are the same as Fig. 2. We also include the mass–size relations of early-type galaxies by Shen et al. (2003, dashed line), Guo et al. (2009, dot-dot-dashed line) and Mosleh et al. (2013, solid line). Right panel: normalized density distribution of the radius for isolated elliptical galaxies (gray solid histogram) and elliptical galaxies in the Coma supercluster (red open histogram). The integral of each histogram sums to unity.