Mean inclination Ī (rad) versus the final embryo mass M_em. The symbol sizes correspond also to M_em and their colours to the embryo number, or its initial position. The horizontal dotted lines indicate multiples of the pebble scale height, h_p = H_p∕r. The smaller vertical distance of the massive embryos from the pebble disc contributes to a runaway growth. All embryos are already in the Hill regime, and their effective accretion radius ranges from R_eff ∕r = 0.003 to 0.012.