TESS SPOC PDCSAP LCs (black points) with the MAP model prediction (top). It is important to note that the long trends and transits have been removed prior to analysis. The red line shows the predictive mean, and the red contours show the predictive standard deviation. Bottom left panel shows the probability density of the rotation period. The period is the parameter P_rot in Eq. (1). The 1σ error bar is indicated with the dashed black lines. Bottom right panel gives the GLS periodogram for all three sectors combined.