Diffusion coefficients for the transport of chemical elements in the radiative interior of 15 M_⊙ rotating models with only hydrodynamic (red lines) and both hydrodynamic and magnetic processes (blue lines) in the middle of the MS (X_c = 0.35). The coefficient D_shear (solid lines) corresponds to the transport by the shear instability, while the coefficient D_eff (dashed lines) is associated with the simultaneous impact of advection by meridional currents and the action of horizontal turbulence on the vertical transport of chemicals.