Stacked amplitude spectra of the g-mode candidate sample (left, in period space) and δ Scuti candidate sample (right, in frequency space) for which the prediction probability is greater than 0.5. Each star forms a single row, sorted by the dominant pulsation, with the colour corresponding to the amplitude. For the g-mode sample, which comprises both the γ Dor and SPB stars, we see a distinct secondary ridge associated with either a harmonic of the dominant frequency or the expected ℓ = 2 dipole modes seen in Li et al. (2020). For the δ Scuti sample, we see ridges associated with the first and second overtones, as well as a harmonic line.