Onset of outflow through the outer Lagrangian point and the ratio of the mass transfer rate between the inner (Ṁ_in) and outer (Ṁ_out) Lagrangian points. The solid (dashed) lines represent the ratios predicted by the extension of Kolb & Ritter (1990) with (without) our correction factors. The star markers on the zero line indicate the characteristic relative overfilling factors at which outflow through the L_out point begins. The colored regions represent the range of overfilling factors for which outflow occurs through both Lagrangian points, as well as the maximum rate ratio over the range of parameters considered.