Product 2r_accv_acc, or equivalently Ṁ_peb,2D∕Σ_peb, as function of embryo mass. Dark lines represent the results of two-body embryo–pebble integrations in 2D, for particles with different Stokes number. The coloured dashed lines correspond to the results from our accretion prescription, covering strong coupling, the decrease to weak coupling, and finally, around the smallest masses, the accretion purely following gravitational deflection. Values shown here are for an embryo at 2.5 AU with headwind velocity ηv_K = 7 × 10³ cm s⁻¹. The simulations presented in this paper start with embyos with a mass of 0.01 M_E.