Horizontally averaged profiles of the composition (top), the discriminants ﹩{{ \mathcal Y }}_{{\rm{S}}}﹩ and ﹩{{ \mathcal Y }}_{{\rm{L}}}﹩ (middle, Equations (1) and (2)), and important frequencies (bottom, the Brunt–Väisälä frequency ﹩{N}^{2}=-{{ \mathcal Y }}_{{\rm{L}}}﹩ and the square convective frequency ﹩{f}_{\mathrm{conv}}^{2}﹩; see Equation (3)). Positive and negative values are respectively shown by the solid and dashed lines. We show the initial (left) and evolved (right, time-averaged over 100 convective overturn times) states. There are no motions in the initial state, so ﹩{f}_{\mathrm{conv}}^{2}=0﹩ and does not appear. The background color is orange in the CZ, green in the SZ, and purple in the RZ. The lightly hashed background region in the evolved RZ is the mechanical overshoot zone.