Evolution through time of the ratio between the accreted mass at a given z and the total amount of accreted stellar mass at z = 0. Left panel: Galaxies with stellar mass ranging from 6.30 × 10⁹ M_⊙ to 2.08 × 10¹⁰ M_⊙. Right panel: Galaxies with stellar masses ranging from 3.28 × 10⁸ M_⊙ to 5.34 × 10⁹ M_⊙. The solid and dashed vertical lines represent the mean look-back time by which the galaxies in those panels had already accreted 50% and 90% of their accreted material, respectively.