Top of panel (a): Period spacing pattern of g modes with degree ℓ = 1 and consecutive radial order n for a stellar model employing the CPM scheme, corresponding to point F in Fig. 4. Radial orders for six modes are indicated by black arrows. Bottom of panel (a): Normalized mode inertia plotted against the periods of the dipole (ℓ = 1) g modes. Panel (b): Horizontal displacement eigenfunctions (ξ_h) of the dipole g modes plotted as a function of the mass coordinate for various radial orders, as referenced in the top panels. Red lines represent the eigenfunctions, and blue lines the Brunt-Väisälä frequency within the stellar interior.