Evolution over time of the maximum angular velocity (absolute value) along the equator in the rest frame of the rotating primary star (S″ coordinate system) at radius 6.6 R_⊙ (k = 5, red), 6.2 R_⊙ (k = 4, blue) and 5.0 R_⊙ (k = 1, black), where k indicates the number assigned to the layer. Initial rotation is uniform. Time zero is the start of the calculation, and the time axis in the three plots is the same. Data are smoothed using a 100-point moving average. Main plot: Synchronous rotation, Case 15 in Table A.1. Inset top: super-synchronous rotation Case 1. Inset bottom: No rotation, Case 17.