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Fig. 5


Top: root-mean-square brightness fluctuation σ as a function of νmax. The symbols have the same meaning as in Fig. 1. The red curve is a power law of the form with the slope p =  −0.51 obtained by fitting the power law to the theoretical values of σ (filled red squares). The filled green square corresponds to the value σ = 39 ppm found for the solar 3D model. Bottom: σ as a function of the quantity z3 given by Eq. (19) where ℳa and are here supposed to scale according to Eq. (17) and Eq. (22), respectively. The green line corresponds to a linear scaling with z3 and the red one to a power law of the form where p = 1.11.

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