Panel (a): Kiel diagram of stellar gravity (log g) against effective temperature (T_eff) for the CPM scheme. The position of KIC 10001893 is illustrated in green with error bars. Eight models with different ages (A = 10 My, B = 27, C = 41, D = 62, E = 78, F = 97, G = 125, and H = 134 million years) are indicated. Panel (b): Same as Fig. 1c, hatched areas indicate semi-convection in the transitional zone between the convective (gray) and radiative (white) regions. All eight models from the top panel are also shown in this panel.