Seismic vs. dynamic parameters for our sample of seven eSB2 binaries. The four main panels show the direct comparison for each of the four parameters log g,, radius, and mass, with the dashed lines indicating the 1:1 relation. The surface gravity g is in cgs units, is in units of 10⁻³⁻ρ_⊙, and R and M are in solar units. The coloured symbols correspond to seismic values based on the new non-linear scalings (Eqs. (7) and (8)) with ν_max and Δν_cor as seismic input. The colour indicates the metallicity [Fe/H]. The grey symbols correspond to the results of classical seismic scaling using the Sun as reference and ν_max and Δν_c as seismic input. The small panels under each main panel show the relative difference between the seismic and dynamic parameters in the sense of (seismic–dynamic)/dynamic. The numbers indicate the mean absolute deviation from perfect agreement for the new scalings (see Table 1).