Top panel: ΔΩ_phot vs. the stellar rotation period P_rot. The highest ΔΩ_phot values have been measured in stars with P_rot ≤ 5d. Bottom panel: the same plot restricted to the MS stars. The symbol sizes are proportional to the stellar masses, which range between 0.6 and 1.35 M_⊙. The black lines are the rotational tracks derived by Küker & Rüdiger (2011) for stars of 0.5, 0.7, 0.9, and 1.1 M_⊙ as labeled.