Effective radius-stellar mass relation for elliptical galaxies. Upper panel − the mass normalized radius is plotted as a function of the stellar mass ℳ_∗. The filled symbols are the cluster ellipticals of our sample (red circles), the field ellipticals we selected at 1.2 <z< 1.45 in the GOODS-S field (blue squares), and the ellipticals at 1.0 <z< 1.2 in the COSMOS field (green crosses). Open symbols are data taken from Raichoor et al. (2012; R12, stars), from Delaye et al. (2014; D14, triangles), and from Valentinuzzi et al. (2010 V10, circles; see also Poggianti et al. 2013a). The green short-dashed line is , the line below which there are no measured effective radii in the COSMOS catalog (Sargent et al. 2007). We report errorbars only in the lower panel just for clarity in the plot. Lower panel − the effective radius R_e is plotted versus the stellar mass. Symbols are as in the upper panel. The big black filled triangles are the median values of our sample of cluster and field ellipticals at z ~ 1.3. The long-dashed line is the best fitting relation over the whole mass range.