Ratio of the azimuthally-averaged rotational-to-infall velocity for a set of protoplanets with and without any second core signatures as determined from infall velocity peaks. The protoplanets in Runs 8 and 11 (Type Ia protoplanets) show signs of second cores in their infall velocities and exhibit values of v_rot ∕v_r < 10 in their inner regions. The protoplanets in Runs 16 and 25 (Type Ib protoplanets) do not show second core signatures, and their rotational velocity is of the order of 3 magnitudes higher than the infall velocity in their inner regions. The significant amount of rotation inhibits the formation of an accretion shock around the second core.