WWZ scalogram for TESS photometry. The wavelet power is indicated by the colour (see colour bar at left). The lower bright stripe corresponds to the period of ∼18 days. A faint stripe appears above it, which corresponds to a period of ∼11 days. Shorter periods of 8 and 5.4 days appear as non-permanent spot-like regions in the upper part on the colour scalogram. The black solid line in the right panel shows the time-averaged wavelet power.