Evolution of stellar mass and magnitudes as a function of remaining subhalo mass fraction. This figure is similar to Fig. 5, but shows the evolution of the stellar mass and the r- and U-band magnitudes as a function of m_sub/m_infall for galaxies with 11.5 < log(m_peak/h⁻¹M_⊙) < 12.0. The symbols represent the data from the MTNG simulation, as shown in Fig. 3, while the dash-dotted lines represent the analytic models described in Sect. 3.2. The different colours represent different host halo masses, as labelled.