ν_max– relation (black line) with the different dashed purple lines representing the lower limit of the rotation ratio Ω∕Ω_K. Solid purplelines mark the limits of the predicted dispersion due to the gravity-darkening effect. Blue inverted triangles represent the extreme fast δ Scuti stars observed by Kepler. Green asterisks represent stars with an inclination-rotation degeneracy (see text). Orange diamonds correspond to the 2% of Kepler δ Scuti stars outsidethe limits when taking into account only 1σ error of theirT_eff measurement (see text). We show only a few error bars for clarity reasons.