Sérsic index (n_Sersic) as a function of B/T ratio for the simulated E-SDGs, coloured according to the mass-weighted average age of the galaxy stellar mass. A linear regression fit is included (solid magenta line) with its 1σ dispersion (dashed magenta line). For comparison, we also include the results by Rosito et al. (2018; magenta squares). The line n_Sersic = 1 is depicted in a black line. See Appendix B for the non-smoothed distribution.