Left: size–surface brightness relation described by the 16 cluster ellipticals (filled red circles) for pure luminosity evolution (upper panel) and for stellar mass and effective radius evolution (lower panel) according to the relation , with R_e ∝ (1 + z)^-0.53 (see Eq. (15)). The effect of this evolution is to move galaxies along the Kormendy relation. Central: size–stellar mass relation of our 16 cluster ETGs evolved to z = 0 according to the above evolution together with the relation described by the local WINGS cluster ETGs. Right: effective radii of the 16 cluster ETGs evolved to z = 0 compared with the effective radii of local WINGS ETGs selected in the same range of evolved stellar masses.