Accreted stellar halo mass fraction as a function of the galaxies’ total stellar mass. Filled circles represent computed mass fraction considering 4 R_h as the inner limit of the stellar halos, while empty circles consider this limit as 5 R_h. the Auriga MW-like galaxies are also shown, represented with triangles (Monachesi et al. 2019). All simulated galaxies are colour-coded with their accreted mass fraction. Observed galaxies taken from the GHOSTS (Harmsen et al. 2017; Gozman et al. 2023) and Dragonfly (Gilhuly et al. 2022) surveys are symbolised with stars and squares, respectively. The stellar halo fraction of the Dragonfly sample considered in this plot is the one computed outside 5 R_h of each galaxy.