Integer multiples of the local radial wavelengths q · λ _r for g ₂ and g ₆ as a function of the star’s radius R. Mode resonance occurs when q · λ _r closely matches the width of a certain region(s) in the star. The left panel is the NOV set’s mode resonance and the right panel is the OV set’s mode resonance. In both panels, the black horizontal lines mark the respective region widths. Blue curves show q · λ _r for g ₂, and maroon curves show q · λ _r for g ₆. The q values are stated in the legend.