Upper panel: power spectra of HIPPARCOS (top), BRITE (middle) and SMEI (bottom, with frequencies c1–c6 (Table 5) appearing between 1.3075 and 1.32 c/d) observations. The three peaks in the SMEI power spectrum correspond with frequencies f1–f3 (Table 5). Lower panel: SMEI (bottom) and BRITE (top) power spectra of the frequency group near 1.31 c/d. The frequency range is stretched by a factor of 2 w.r.t. the upper panel so that base frequencies and harmonics line up. The power scales are arbitrary and cannot be compared between the satellites. The SMEI power scales for the two frequency groups differ by about a factor of 20.