Phase-folded TESS light curve (left) and RVs (right) of TOI-521 b from the joint photometric and RV analysis. The bottom panels show the model residuals. The best-fitting model is plotted as a solid black line. In the transit plot, the black dots show the data binned over 15 min. In the RV plot, the error bars include the jitter term, added in quadrature to the nominal error, and the shaded grey area highlights the ±1σ region.