Ratios of the tangential velocity (v_θ) to the radial velocity (v_r) as a function of frequency, at different radii throughout the stellar interior for different stellar masses. The black line represents the ratio of the Brunt–Väisälä frequency to the linear IGW frequency, at that particular radius. The first row shows v_θ/v_r inside the convection zone, the second and third rows show the ratios at 0.1 H_P and 0.25 H_P, respectively, and the final two rows show the ratios at a randomly chosen radius inside the radiation zone and close to the top of the simulation domain, respectively.