Model predictions for the distribution of accretion redshifts for subhalos with m _a / M ₀ = 0.1 (solid lines), 0.03 (dotted lines), 0.01 (dashed lines), 0.003 (long dashed lines), and 0.001 (dot-dashed lines), respectively. Results are shown for host halos of different masses as indicated in the panels. These results assume a ΛCDM universe and are compared with the results obtained from the 300  h ⁻¹ Mpc box N-body simulations with the same cosmology (open circles). For comparison, results obtained from the 100  h ⁻¹ Mpc box simulations are also shown (as filled triangles) for cases in which statistics are sufficiently good.