Fourier amplitude spectrum of the MOST light curve of HR 8799. The actual spectrum is shown in the positive amplitude range, while the 28-frequency solution, listed in Table 1, is represented by thick vertical lines in the negative amplitude range. Instrumental frequency components are marked by dotted lines. The most prominent frequencies and frequency groups are labelled. The n/9 f₁ frequency grid is indicated by dashed gray lines. The insert shows the window function of the data. The only high-amplitude alias is at the orbital frequency of the satellite, which causes aliasing only far out of the investigated range.