Specific angular momentum in the central 5 solar masses of the stellar model at representative evolutionary stages. Shown are the initially 315 M_⊙ models with an initial rotational velocity of 300 km s⁻¹, using the hydrodynamical (top panel), Tayler-Spruit (middle panel), and solid-body (lower panel) coupling schemes. MLT++ is used in these models. We note the different vertical axis scale in the lower panel.