ExTrA light curves for the three nights of observations (columns) and for each telescope (first line corresponding to telescope 1, second line to telescope 2, and third line to telescope 3). Our raw data are shown in blue, and modeled using Gaussian processes in black. The detrended light curves are shown (gray dots), with the maximum a posteriori model transit (in red). The residuals below correspond to the modeled transit subtracted from detrended data points.