From left to right: periodograms of KOI-206, KOI-614, and KOI-680. Top panels: Lomb-Scargle periodogram of the complete light curve. Middle panels: mean Lomb-Scargle periodogram of the light curve divided in chunks. Bottom panels: light curve autocorrelation. The green dashed lines indicate the center of Gaussians fitted to the data to derive the main frequency and its harmonics. The red vertical line corresponds to the maximum rotation period deduced from the vsini_⋆ and the star radius, and the shaded areas are the associated 1, 2, and 3σ upper limit regions from the darkest to the lighter ones, respectively.