Predicted ratio of the g-mode cavity rotation frequency over the surface rotation frequency accumulated across evolution for a 1.3 M_⊙ model starting with (Ω/Ω_c)_i = 0.1. In these models, AM transport is modelled by a constant uniform viscosity, which is shown in the legend (in cm² s⁻¹). The solid lines are for f_ov = 0.005, and the dashed-dotted lines for f_ov = 0.035. The typical upper limit of the observed range of core-to-surface rotation is shown by the upper horizontal grey dashed line. The lower grey dashed horizontal line indicates solid body rotation.