Tidal perturbation of the dominant (k, m) = (0, 1) g mode of KIC 3228863, with ν = 1.974605(3) d⁻¹. Top: Pulsation amplitude modulations as a function of the binary orbital phase, calculated numerically within separate orbital phase bins (red) and reconstructed using pre-whitened sine waves (black), with their 1 − σ uncertainties (thin dashed lines). The binary eclipses are marked in grey. Bottom: Pulsation phase modulations as a function of the binary orbital phase, calculated numerically from binned data (red) and reconstructed using pre-whitened sine waves (black).