Surface rotation period (P_rot) as function of the polar surface field strength (B_p) during the main-sequence evolution of our 1.5 M_⊙ models. The corresponding ZAMS values are shown by gray squares with B_p = 10, 100, 1000, and 10 000 G and P_rot = 1, 10, 100, and 1000 d. As evolution progresses, the models increase their rotation periods and decrease their magnetic field strengths as indicated by the gray dashed lines. Colored dots are placed on these evolutionary tracks every 200 Myr, with the color indicating the total amount of mass lost during the previous evolution (see color bar to the left). Kinks close to the last points in models with B_p, ini ≤ 100 G indicate the TAMS turnoff.