Mass-transfer rates from our calculations compared to the global KH rate (as given by Eq. (6)). The top panel shows results for a 2 M_⊙ donor star, whilst the bottom panel shows results for a 5 M_⊙ donor star. In each panel, the coloured lines show the difference between the mass-transfer rate predicted by Eq. (6), (which assumes the rate is governed by the global KH timescale at the onset of mass transfer) and the mass-averaged mass-loss rate ⟨Ṁ_d⟩_M (see Eq. (10)) from our calculations. Vertical dashed black lines indicate the base and the tip of the RGB.