Evolution of the reference model. The stellar rotation period and radius are shown in panels a and b, respectively. The different torque contributions are shown in panel c. The accretion torque Γ_acc, the influence of the magnetic star-disk interaction Γ_ME, the APSW torque Γ_W, and the internal contributions due to variation of the stellar moment of inertia Γ_int are shown as a solid blue line, dashed blue line, dotted blue line, and dash-dotted blue line, respectively. The total torque Γ_tot, defined as the sum of the other torque contributions, is shown as a solid black line. A gray dashed line marks the change between the spin-up and spin-down regimes.