Local asymptotic value of the gravity offset according to the model considered in Sect. 4.1. It was computed via Eq. (32) in case a (blue) and Eq. (39) in case b (red). The cases a and b are defined in Sect. 4.1. It is shown as a function of the ratio 2πν_max/𝒩_b, where 𝒩_b is the value of the (modified) Brunt–Väisälä frequency just below the base of the convective zone. Stellar evolution goes from the right to the left.