Seismic diagram of 58 RGB stars in Howell et al. (2022). The selected isochrones with a variation of Λ_e = 0.05, 0.5, 0.6 are superimposed by solid lines. The distinguished excess stars in the H22 sample are circled in blue. Star count histograms on ν_max and Δν are shown in the top and right panels, correspondingly, in which the blue-hatched area indicates the H22 data and the lines represent model predictions.