Mixed mode coupling q of SGB stars as a function of ν_max. Observed couplings from Appourchaux (2020) are shown as squares, and from Mosser (2024, priv. comm.) are shown as circles. Mass is calculated using the asteroseismic scaling relations (Kjeldsen & Bedding 1995), and is indicated using colour. Model tracks with masses 1 M_⊙ and 1.5 M_⊙ with [Fe/H] = −0.5 are shown as dashed lines, and with [Fe/H] = 0.0 as solid lines. Stars evolve from right to left.