Ratio between the accreted mass and the total stellar mass of each galaxy as a function of radius. The colour bar shows the DM mass values of the galaxies. The solid vertical lines mark 4 R_h (i.e. the beginning of the stellar halo) and 5 R_h, and the horizontal dashed line marks 50% of the mass fraction. The inner stellar halos (from 4 to ∼6 R_h) are dominated by in situ material. Galaxies with M_* ≤ 4.54 × 10⁸ M_⊙ are dominated by in situ material at all radii.