TESS and ground-based light curves of TOI-1685. Upper panels: PDC simple aperture photometry (SAP) TESS light curve of TOI-1685 and the corresponding phase-folded light curve. Lower panels: phase-folded light curves of LCOGT, PESTO, and MuSCAT2 in filters i and z_s of TOI-1685. For all phase-folded light curves the residuals are shown for the USP found in the system. White circles are binned data(shown only for reference; the data used to fit the model were the unbinned points). Black curves are the best-fit models, and light and dark blue areas are the 68% and 95% credibility bands, respectively. The different sizes of the MuSCAT2 error bars correspond to the two observing nights.