Fig. 2.
Schematic view of the modified Brunt–Väisälä frequency as a function of radius on a logarithmic scale, as assumed by the simple model presented in Sect. 4.1. The horizontal dashed line indicates the value 𝒩b just below the base of the convective zone at radius rb. The radius 
represents the location of the hydrogen-burning shell, in agreement with its definition given in Sect. 3.2.
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