Modeling of the TESS data. Two left panels: TESS photometry time series from Sectors 9 and 35 along with the maximum a posteriori (solid black line). Three right panels: phase-folded light curve to the period of the planet (black points correspond to one-sixth of the transit duration for each planet). The three panels are associated with the b, c, and d planets, respectively. The dark area to the left on the far right plot is due to the transit of the other exoplanets that happened close to the transit of TOI-663 d.