Evolution of diffusion coefficients in the 0.1 v/v_crit models. The lavender and off-white regions show convective and radiative zones, respectively. Multiple diffusion coefficients overlap a given zone, but the dominant coefficient is the one with the highest magnitude along the y-axis. D_conv is the convective diffusion coefficient, K_ther is the thermal diffusivity coefficient, D_shear is the shear (vertical) mixing coefficient, D_h is the horizontal mixing coefficient, and D_eff is the effective mixing coefficient. Top row: 1000 M_⊙ model at the onset, middle, and end of core hydrogen burning. Centre row: 5000 M_⊙ model at the beginning, middle, and end of core hydrogen burning. Bottom row: 9000 M_⊙ model at the start, middle, and end of core hydrogen burning.