Size relations for the simulated galaxies and their host dark matter haloes: r_HM = 0.04 × λr₂₀₀. Upper panel: simulated galaxies are colour-coded according to the D/T ratio: D/T> 0.6 (red filled squares), 0.4 <D/T< 0.6 (green filled diamonds), 0.4 <D/T< 0.2 (blue crosses), and D/T< 0.2 (pink filled circles). Lower panel: the colours correspond to the different redshifts: z = 0 (red circles), z = 1 (green squares), z = 2 (blue triangles)