ExTrA transit photometry observations of TOI-4860 b in the Z*, Y, J, and H* bands (error bars). Each line corresponds to a night (with format YYYY-MM-DD) and ExTrA telescope (labelled T1, T2, and T3) observation, which are offset vertically for clarity. For each transit, the median model (black line) and 68% CI (grey band, barely visible) computed from 1000 random posterior samples are shown.