Raw data points of the first CHEOPS visit (blue circles). The transit of the 1.04 d planet is visible at the centre of the visit. The mid-transit time, as predicted by the TESS ephemeris, is highlighted with a vertical green line, while the area coloured in light green is the corresponding 3 σ interval of confidence. The mid-transit time predicted with the ephemeris in the third column of Table 5 is marked with a vertical red line. The time difference between the red and the green lines is ~1 h.