Top panel: zoom into the second half of CHEOPS#2 and CHEOPS#3 transits (orange and blue data points, respectively) plotted against each other, according to the phases derived from the best-fitting joint solution (Sect. 4.2). The colour code is the same as in Fig. 2. Middle panel: same as in the upper panel, but with a leftward TTV correction of 3.9 min applied to the CHEOPS#3 transit (blue data points). We note that both the egress and the structures due to occulted active regions overlap, confirming the time shift. Bottom panel: determination of the time-shift with a phase dispersion minimisation analysis (see text in Sect. 4.6).