Evolution of the different external torque components (Γ_acc, Γ_me, and Γ_w: solid blue, dashed blue, and dotted blue lines, respectively), the internal contribution to the stellar spin evolution Γ_int (blue dash-dotted line), and the combination of these mechanisms Γ_tot (black solid line) for different initial rotation rates Ω_init. The value of the reference model is marked in boldface. The horizontal dashed black line divides the regions in which the star spins up and down.