Frequency analysis of the combined data set for γ Psc (left) and θ¹ Tau (right). The top panels show normalised comb response (NCR) of the six highest frequencies. The échelle diagrams (bottom panels) were calculated for the highest peak in the comb response function of γ Psc and θ¹ Tau. Solid dots represent modes with an S/N ≥ 5. Open circles show the original position of modes that were shifted by 11.574 μHz. The crosses in the échelle diagram for γ Psc mark the position of multiples of the daily aliases.