Frequencies and radial orders n_p of ℓ=1 and ℓ=2 p modes with n_p≤4 for the 16.9 M_⊙ 3D MHD merger product (blue and light-blue markers) and the 17.4 M_⊙ genuine single star (red and orange markers) at different evolutionary stages, in the absence of rotation. The models at X_c=0.01 and X_c=0.10 are absent because of the lack of pure p modes at these evolutionary stages. The dot and cross markers show the value of the radial order n_p for the ℓ=1 and ℓ=2 modes, respectively. The dotted and dash-dotted lines are drawn to accentuate the frequency differences and improve the legibility of the frequency values.