Distribution of the spot filling factor vs the longitude and time derived by our maximum-entropy spot model of the TESS light curves in Sectors 20, 50, and 51. The maximum of the filling factor is indicated by the purple colour and the minimum by dark blue (see colour scale in the lower right corners). We note that the longitude scale is repeated beyond the [0°, 360°] interval to better follow the migration of the spot features. Each TESS sector is split into two intervals to skip the data gap. The solid white lines help one to track the spot evolution from one active longitude to the other.