Predicted chemical diffusion coefficient from IGW mixing at different parts of the main sequence (solid lines). Dashed-dotted lines indicate the results of the hydrodynamical simulations performed by Varghese et al. (2023). The drop in the amplitude of the numerical profiles near the surface is due to the radial velocity being forced to zero at the top of the simulation domain (0.9R_⋆ in these models) in the hydrodynamical simulations.