Absolute differences between the 17.4 M_⊙ genuine single star's p-mode frequencies ${\nu }_{n_{\mathrm{p}}}^{\text{s}}$ and the 16.9 M_⊙ 3D MHD merger product's p-mode frequencies ${\nu }_{n_{\mathrm{p}}}^{\text{m}}$ per radial order n_p, in the absence of rotation. The (ℓ, m)=(1, 0) and (ℓ, m)=(2, 0) modes are shown in the upper and lower panel, respectively. The lines are colour-coded according to the merger product's central hydrogen fraction X_c.