Luminosity histogram of our BoOST models with an MW composition (yellow). The original is taken from Neugent et al. (2020), including M31 observations (black) and theoretical predictions from the Geneva (green) and BPASS stellar models (red and blue) for solar metallicity. An even larger and more recent dataset of M31 observations from Massey et al. (2021) is overplotted (violet). Our MW population follows the observed luminosity histograms as closely as the Geneva and BPASS stellar models. See Sect. 3.4 for further details.