Iterative pre-whitening for the extraction of frequencies for HD 94493 (Sectors 63 and 64). Left: Calculated amplitude spectra (Lomb-Scargle periodograms) shown in logarithmic scale. A vertical line at the top of each panel points toward the extracted frequency, which is reported in the lower left. Right: Light curve of the star (black points) with the integrated fit model of sinusoidals superimposed (red).