Top: profiles of the ℓ = 0 large separations for the observations (black filled circles and dotted lines) and for two models that closely reproduce the oscillation due to the Γ1 bump. The red solid curve corresponds to the best-fit model obtained in Sect. 5 and the blue dashed curve to a model computed with αconv = 0.68, Y0 = 0.24, αov = 0.10, and [Z/X] = 0.14 dex, using the GN93 mixture. Bottom: same as the top panel for the ℓ = 1 large separations.
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