(Upper panel) Zoom-in section of the reduced Kepler light curve (black dots, brightest at the top) and residuals (grey dots) of KIC 4931738 after prewhitening with a model (red solid line) constructed using the set of 1082 significant frequencies – see text for further explanation. (Lower three panels) Scargle periodogram of the full Kepler light curve (blue solid line) showing the 262 selected frequencies (red vertical lines). For better visibility, the red lines are repeated in grey in the background, after multiplying their amplitude with a factor ten, and the signal from outside the plotted ranges is prewhitened for each panel.