TESS light curve of TOI-1453 (29 sectors comprised between sector 14 and sector 76) together with the transit model in black. (a) Full TESS light curve. The zone highlighted in purple illustrates the timespan of the HARPS-N observations. The three deeper transit features in the model correspond to simultaneous transits of planets b and c. (b) TESS light curve phase-folded on the transits of TOI-1453 b (TOI-1453.02). The orange dots are binned TESS data for better visibility. (c) Same for TOI-1453 c (TOI-1453.01), where the green dots are binned TESS data.