Distribution of mass-normalized radius and stellar mass density for cluster and field elliptical galaxies. Upper panel − distributions of the mass normalized radius (left) and of the effective stellar mass density Σ_Re (right) for cluster (red histograms) and field elliptical galaxies in the GOODS-South field (blue histograms) and in the COSMOS area (green histograms). The effective radius R_e is normalized to the stellar mass where m_∗ = ℳ_∗/ 10¹¹M_⊙.Colored solid lines mark the median values of the distributions. The black dotted line marks the median value Σ_Re = 2500 M_⊙ pc^-2 of the elliptical galaxies in cluster and in the GOODS-S field.Lower panel − same as in the upper panel but the comparison is made with the field elliptical galaxies selected in the CANDELS area (cyan histograms).