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Fig. 6


Top panels: normalised échelle diagrams of an RGB (left) and RC (right) star with l = 0, 1, and 2 modes indicated by red circles, green triangles, and blue squares, respectively. Bottom panel: radial mode sequence of 48 RGB (open light-red circles) and 89 RC (open light-blue squares) stars with Δνc ranging from 4 to 5 μHz. The abscissa is corrected for the phase shift of the central radial mode. Average values per radial order are given by blue-filled squares (RC stars) and red-filled circles (RGB stars) connected by broad dashed and dash-dotted lines, respectively. Error bars indicate the rms scatter. Thin lines give the slope of a linear fit to the mode sequences, which differ by about 1.5%.

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