ExTrA light curves of the four different transits, observed with two telescopes (left panel: first telescope; right panel: second telescope). From top to bottom, the first transit is complete, while the remaining three show only the egress. The best-fit juliet models are shown as black lines, with 1σ model uncertainties indicated by the gray shaded regions. Dark red circles represent the data binned to 10 minutes. The dashed vertical line define the transit midpoint. An arbitrary offset has been added between the transits for clarity. See Sect. 5.2.3 for details on the modeling.