TESS light curves of TOI-1801 (sectors 22 and 49, blue dots). The vertical orange lines indicate the location of the planetary transits of TOI-1801 b. Top panel: SPOC PDCSAP fluxes. Middle panel: SPOC SAP fluxes; the black curve stands for the stellar activity plus planet transit model, the model 1σ uncertainty is shown by the grey shaded region. Bottom panel: detrended SAP light curve; the black line shows the best fit from a transit-only model. All photometric data points are plotted together with their error bars.