Sum C₁(P₁,P_min,1) (Eq. (12)) of the 228 values of a model based on 76 g-mode dipole triplets with the splitting value s₁ = 210 nHz, applied to the power spectrum of Fig. 7, smoothed over 6 bins. The two free parameters of the model are the equidistant period spacing P₁, defining the abscissa, and the period P_min,1 of the first selected mode, defining the ordinate axis. The first (lowest) sharp peak is located at 30 360 ± 15 s (FWHM) and covers the radial order range from −20 to −95, the second (upper part of the figure) covers the radial order range from −21 to −96. The equidistant period spacing is 1443 s, or 24 min 03 s, within less than 1 s.