Squared Brunt-Väisälä N2 (solid lines) and Lamb S2 (dashed lines) frequency as a function of the fractional radius for model M1 (black lines) and M2 (grey lines). The blue lines indicate regions where N2 is negative, and are therefore convective. The inset shows the outermost region and the frequency range of the observations (grey-shaded area between the red lines).
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