(Upper panel) Part of the reduced CoRoT light curve, showing distinctive sharp recurring features every  ≈ 1.9 days. This can be seen easily around 3255 CoRoT JD, where the occurrence of features causing the highest amplitude variations is clearly periodic. (Middle panel) The Scargle periodogram of the full CoRoT light curve showing a series of harmonics at integer multiple frequencies of the main peak at f₀ = 0.52687 ± 0.00004   d^-1. (Lower panel) Θ_PDM-statistics of the light curve, showing the same structure as the Scargle periodogram.