Evolution of the size-mass relation of galaxies, plotting effective radius versus stellar mass for three redshift ranges: 0.70–1.00, 0.50–0.70 (VIPERS), and 0.02–0.08 (SDSS data). Each galaxy is colour coded according to its d4000 value as indicated in the colour bars along the bottom. Black diagonal dashed lines indicate lines of constant inferred velocity dispersion of 100, 150, and 225 km s^-1 following Franx et al. (2008).