Internal variation of ∇_r − ∇_ad for three models with a mass loss rate of 5 × 10^-14   M_⊙   yr^-1 at the onset of the ZAMS. The surface is at  log ΔM/M_∗ = −12 and transport is convective when ∇_r − ∇_ad > 0. For different masses, the position of convection zones in relation to  log ΔM/M_∗ changes slightly, though it is constant in relation to T.