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Fig. 9.

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Prandtl number profiles for a 5 M model. The blue line shows the ESTER model with a constant kinematic viscosity of ν = 107 cm2/s. The orange line represents the Prandtl number profile in the envelope based on the polytropic model described in Sect. 4.1.1. For comparison, the radiative Prandtl number, P rad $ {\cal {{P}}}_{\mathrm {rad}} $ is also shown (see Eq. (35)).

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