Time evolution of difference between maximum rotational velocities of FG and SG is shown for different models and relevant mass groups. The low-mass bin (0.1-0.3 M_⊙) is shown in blue, the intermediate-mass bin (0.3-0.7 M_⊙) in orange, and the high-mass bin (0.7-1 M_⊙) in green. Delta0 is denoted by a solid line, Delta45 by a dashed line, Delta90 by a dotted line, and Delta180 by a dash-dotted line. For the clarity of the figure, we only show best-fit lines to the data. The largest difference between generations can be seen in the lowest mass bin.