PoMS rotational evolution models with angular momentum diffusion coefficient scaling with the ratio Ω_rad/ Ω_env according to Eq. (3). A solid-body interior rotation profile is enforced until the TAMS. Upper panel: as in Fig. 2, but showing various non-zero α models as well. For each value of α, the scaling parameter D₀ is calibrated to match the most evolved star in the D+14 sample. Lower panel: evolution of D as a function of log g. The values of D₀ shown in the legend are in cm² s^-1.