Relative tidal perturbation of all selected (k, m) = (0, 1) g modes of KIC 3228863. Top: phase-folded Kepler light curve of KIC 3228863 (black). The eclipses are marked in grey, with the dashed lines indicating the centres of the eclipses. Middle: pulsation amplitude modulations as a function of the binary orbital phase, calculated numerically within separate orbital phase bins and divided by the average intrinsic mode amplitudes. Different line colours scale with the average intrinsic mode amplitudes, from high (black) to low (yellow). The binary eclipses are marked in grey. Bottom: differential pulsation phase modulations as a function of the binary orbital phase, calculated numerically from binned data, with ⟨ϕ⟩ indicating the average intrinsic mode phase.