Buoyancy radius as a function of central hydrogen abundance X_c (relative to the initial X_c) along main-sequence evolution. Left: for three different masses typical of γ Dor: 1.4 in blue, 1.6 in green and 1.8 M_⊙ in red, same metallicity [M/H] = 0.1. The colour coding is the same as in Fig. 1. Right: for a 1.4 M_⊙ model, with varying metalicities from [M/H] = −0.9 to 0.5, with increments of 0.2 dex. The X_c/X_c, init axis has been inverted to emphasize the behaviour with evolution. The models were computed with disc locking during 5 Myrs, to a disc rotating with a period of 7.2 days.