Rotational analysis of KIC 3233612. (a) PSD of the star. The stellar rotation period is shown in the orange area, while the green area shows the high-amplitude peak at around 0.6 days. (b) Period-time analysis of the stellar light curve. High-amplitude periodicity is highlighted by orange and red, whereas yellow and blue denote low-power amplitude. The yellow discontinuous structure appearing around 0.6 days results from background contamination. The shaded area represents the cone of influence of the reliable periodicities.