Power spectrum of the quiescent light curve of FS Aur (left panel) and its corresponding spectral window (right). The strongest peak in the window at f_Y = 0.00274 day^-1 corresponds to the yearly observational cycle. The f_VLPP = 0.001114 ± 0.00015 day^-1 frequency corresponding to VLPP is the second-highest peak in the power spectrum, with the strongest peak being f_alias = 0.00114 + 0.00274 = 0.00388 day^-1, an alias created by the beat between f_VLPP and f_1y.