Fraction of the orbital separation falling within the gravitational focusing radius of the embedded object, R_a/a, as a function of the binary mass ratio q_r. The plot shows the relation for f_k = 1.0, 0.9, and 0.8, where f_k is the fraction of the Keplerian velocity contributing to the relative velocity. Markers show the points for which hydrodynamical simulations have been performed in this paper. For small mass ratios, the accretion radius of M₂ is small relative to the orbital separation. When q_r is large, R_a sweeps out a significant fraction of the orbital separation. For fixed M₂, q_r increases as the embedded object spirals further into the envelope of the primary.