Observed specific angular momentum (j_obs = I_∗Ω_env/M_∗) evolution (solid line) and actual specific angular momentum (j_true = (I_coreΩ_core + I_envΩ_env)/M_∗) evolution (dotted line) for the fast (blue), median (green), and slow (red) rotator models. The blue, green, and red tilted squares represent respectively the 90th, 50th, and 25th percentiles of the observed specific angular momentum computed from the cluster’s rotational distributions. The open circle is the specific angular momentum of the present-day Sun.