Stacked GLSP for full K2 data (top three panels, stacking at intervals of ± 10 d, ± 20 d, ± 30 d) and σ-clipped data (out-of-eclipse data; bottom two panels, stacking at intervals of ±10 d and ± 20 d). The most significant periods detected in the individual GLSP are marked with vertical lines (see text for discussion). In each panel, x-axis shows periods, and y-axis shows date (in K2 mission days) around which we consider the time interval to estimate the SGLSP. Dates for which no data are available are left blank. Color scale is set so that purple is equivalent to 95% significance and dark blue is equivalent to 90% significance for a red noise model with the same number of points, similarly distributed (see text).