Comparison between structure and seismic properties of rHB (left panels) and RC (right panels) reference models (see Sect. 3). Upper panels: propagation diagrams of the dipole modes, with blue and orange lines corresponding to the modified Brunt–Väisälä and Lamb frequencies (Takata 2006), respectively. The grey bands represent the frequency domain of expected solar-like oscillations, and at their centre the dashed cyan lines indicate the ν_max values. The insets are zoomed-in views of the evanescent zones, delimited at ν_max by the red and black points. Their different extension translates to a different coupling between g and p cavities (see main text). Lower panels: normalised inertia, E_norm, and period spacing of the dipole modes, ΔP, as functions of the eigenfrequencies, with the red curve representing, for comparison, the E_norm of radial modes. The dashed green line indicates the value of the period spacing from the asymptotic theory of high-order g modes (ΔP_a; Tassoul 1980), and the grey band and the dashed cyan line have the same meaning as in the upper panels.