Top: solid black line shows the profile of the Brunt-Väisälä frequency N₀ normalised by ω₀ for the non-rotating stellar model. The red lines show N₀ for the Ω = 0.84Ω_K model along the polar (solid line) and equatorial (dashed line) radii. A thick red tick on the x-axis indicates the polar radius R_p. Top: map in a meridional plane of N₀ normalised by ω₀ for the Ω = 0.84Ω_K model. The black line is the star surface.