Time evolution of M1 (top panel), M2 (middle panel), and M3 (bottom panel). The first column shows the evolution of mass-transfer rate (left y-axis) and NS radius (right y-axis). The second column shows the accretion torque. The third column shows the NS mass (left y-axis, dashed black line) and various radii (right y-axis: magnetic, corotation, light-cylinder, and NS radius). The fourth column shows the spin period (left y-axis) and orbital period (right y-axis). Gray regions indicate post-transition evolution, with non-solid tracks for M2 and M3. For a detailed description of the three spin evolution scenarios, see the main text.