Top: stellar surface density profiles of the Romeo and Vinter-gatan (Agertz et al. 2021) simulated galaxies, together with the MW profile taken from Lian et al. (2024) and the best-fitting morphology of McMillan (2011). The former MW profile has been normalised to enclose a stellar mass of 4×10¹⁰ M_⊙. The dot-dashed orange line depicts a falling exponential profile with scale-length of 2.6 kpc. Bottom: star formation rate as a function of time in Romeo calculated with timesteps ∆t = 10 Myr (orange), ∆t = 100 Myr (purple) and ∆t = 500 Myr (blue).