Upper panel: spin parameter (λ) distribution on the mass–size plane for E-SDGs (left panel), E-DDGs (middle panel), and all galaxies (right panel) in the EAGLE simulation. The lines are the same as in Fig. 2. Lower panel: λ − ϵ plane colour-coded according to stellar-mass weighted ages. We show the slow rotator region according to the definition in Graham et al. (2018) (black lines). Lower right panel: histogram of λ for the complete sample. See Fig. 4 for the smoothed version.