Top panel: the phase shift ϵa of the central radial mode as derived from the average Δνa with the ϵ(Δν) function from Mosser et al. (2011b) superimposed (dashed line shifted by –0.05 for better visibility). The classification is taken from Fig. 4 with red circles indicating H-shell burning stars and blue triangles core He-burning stars (including secondary clump and AGB stars). Bottom panel: relative difference between central and average Δν. Uncertainties are typically well below 1%.
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