Near-core rotation rate (Ω_nc/2π) as a function of the ratio of rotation rate between the convective core and the near-core radiative region (Ω_cc/Ω_nc). The models include angular momentum transport by meridional currents and shear instabilities, but do not include internal magnetic fields. The models are computed from the zero age main sequence assuming initial solid-body rotation (Ω_cc/Ω_nc)_ini = 1, with different initial rotation rates as indicated in the figure. The triangles over the evolutionary tracks indicate the time the central hydrogen content reaches X = 0.7, 0.5, 0.35, and 0.1 (from left to right, respectively). The data points correspond to the constraints provided by Saio et al. (2021).