Comparison of the power spectra of the photometric and spectroscopic PDS of θ¹ Tau. The top panel shows the power spectrum and the spectral window of the MOST data set as black line and red shaded region, respectively. The spectral window depicts the position of the orbital aliases and reveals that the range around ν_max is nearly free of contaminations. The three main peaks in the region around 90 μHz in the MOST spectrum correspond to frequencies also detected with the ground-based campaign (red dashes). The bottom panel shows the unprewhitened power spectrum of the combined spectroscopic campaign data. The blue horizontal line indicates an average large frequency separation found for θ¹ Tau. The lower and upper horizontal red line indicates the noise level and five times the noise level.