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This article has an erratum: [https://doi.org/10.1051/0004-6361/201525895e]


Fig. 2

image

Acoustic radius of the Heii  zone (top panel) and corresponding amplitude of the oscillatory signal at νmax (middle panel), and characteristic width b (bottom panel), as a function of νmax for all the stars of the sample. The 68% Bayesian uncertainties listed in Table 1 are overlaid for all the measurements.

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