Size-mass relation of blue-cloud galaxies (d4000 < 1.55), plotting effective radius r_e versus ℳ for the same three redshift ranges as in Fig. 8: 0.7–1.0, 0.50–0.70 (VIPERS) and 0.02–0.08 (SDSS). Each galaxy is colour coded according to its d4000 value, as indicated in the colour bar along the bottom. Black dashed lines indicate inferred velocity dispersions of 100, 150, and 225 km s^-1. Magenta lines indicate effective stellar mass surface densities Σ_e = 1000 and 2000 M_⊙ pc^-2 as used in Gargiulo et al. (2016).