Initial distribution of periods at 5 Myr (top panels) for 0.9–1.1 M_⊙ stars projected to 13 Myr (middle panels) and 130 Myr (bottom panels) using three models: strong core-envelope coupling (τ_c = 1 Myr, left panels), weak core-envelope coupling (τ_c = 100 Myr, middle panels), and a velocity-dependent coupling timescale (τ_c = 100 (ω/ω_⊙)^-1 Myr, right panels). The observed distributions are shown as black shaded histograms, the projected ones as red bar histograms.