O − C diagrams of the TOI-4562 b transit. Left panel: O − C diagram for all seven events according to the HEI23 ephemeris. In addition to the large O − C value for cycle #8 observed from OPD/LNA, the O − C for cycle #7 observed by TESS is also notable. Top right panel: O − C diagram of the TOI-4562 b transits, according to the ephemeris described in Equation (1). The observed midtransit times are shown as filled circles, while the model is shown as a green curve. Bottom right panel: Residuals from the fitting in the top right panel, with the respective error bars. The colour coding of the data points denotes the observatory and is the same in all panels: black for TESS, yellow for LCOGT, and magenta for OPD/LNA.