Reduced phase shift and central small frequency separation for RGB (circles) and core He-burning stars (triangles) with the symbol colours coded according to stellar mass. Inserts show the mass dependency of the various parameters along with a linear fit (red lines). In the insert of the top panel, RGB and RC stars are indicated by grey circles and black triangles, respectively. Note that stars with Δνc below 1.5 μHz are excluded here because their uncertainties are too large. Colours are given only in the online version.
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