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Fig. 3.

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Top: Frequency-power spectrum divided by the granulation background in the original (light) and uniformly smoothed (dark, window = 0.15 μHz). The vertical lines highlight the observed radial ( = 0), dipole ( = 1), and quadrupole ( = 2) modes. Middle: Échelle diagram. The axes are flipped for illustration, showing observed radial  = 0 and quadrupole  = 2 frequencies and the best-fit frequencies from our reference radial mode fit. The heat-map data were uniformly smoothed with a window = 0.075 μHz. Bottom: Statistical significance of the O-C residuals relative to the measurement uncertainty σ. The marker-size was rescaled (in log10) to demonstrate the statistical weight 1/σ2 applied to each observed frequency in the asteroseismic inference.

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