Cumulative angular momentum and Ω/Ω_c in a M = 0.7 M_⊙ model that has added about 0.055 M_⊙ of matter with j_a = 5 × 10¹⁷ cm²s^-1 at a rate of Ṁ = 10^-6M_⊙ yr^-1. For the uniformly rotating model this is just enough to bring it to critical rotation, whereas in the differentially rotating model enough of the angular momentum has been transported to layers deeper in the star (between m ≃ 0.65–0.75 M_⊙) to prevent the surface from rotating critically.