V1298 Tau longitudes time-series (upper panel). The blue points indicate the large spots (Spot A), while the orange points are the small spots (Spot B). GLS periodogram performed for the longitude values obtained for Spot A and Spot B, respectively (lower panels). The red horizontal line indicates the FAP level at 0.1% and 10%, respectively. The black dashed lines highlight the rotational period of the star and its harmonic.