Light curve and period analysis for the sample star EPIC 220332155. Panel (a) shows the K2 C08 light curves obtained from the Kepler archive (blue) and Everest (red). Both light curves show a clear double-dipping signal. The power spectra in panel (b) were calculated from a phase dispersion minimization (PDM; orange, displayed as 1 − θ) and a Lomb-Scargle periodogram (green). The rotation periods identified by RH20 (14.7 d) and us (28.9 d) are both indicated. Panels (c) and (d) show phase-folded plots based on the RH20 period and ours, respectively. In panels (a), (c), and (d), we have shifted the Everest data vertically by 0.005 units for visibility reasons. Typically, trending is pronounced in Everest data; here, it is in the shape of a downward slope.