Diffusion coefficients D_shear and D_eff between the convective thermal pulse and envelope, just prior to the PIE for 1 M_⊙, [Fe/H] = −2.5, v_ini = 30 km s⁻¹ models with C_T = 0 (no TS dynamo), C_T = 50, and C_T = 216. The profiles of angular velocity (Ω) and hydrogen mass fraction (X_H, scaled by 10⁹ and 10³, respectively) are also shown. Grey- and orange-shaded areas indicate convective and overshoot zones, respectively.