Faber–Jackson relation for the simulated SDGs (filled circles, coloured according to the dynamical B/T ratios) estimated by using σ₀ (left panel) or σ_e (right panel). For comparison, the corresponding relations obtained from the clean ATLAS^3D sample are included (see Sect. 4). The linear regression to the simulated data (green solid lines) and observational data (black dashed lines) are depicted for comparison.