Statistical correlation between the blue (T2/B) and red (T2/R) LBC light curve of the second transit. Upper panel: observed minus calculated (O−C) residuals from the best-fit transit model as a function of orbital phase for the T2/B (square points) and the T2/R (round points) time series. Data are color-coded according to whether they are labeled as off-transit, in-transit (the spot feature being excluded) and spot only. Only points whose mid-exposure time can be matched within 30 s to a frame of the other channel are considered here. Lower panels: correlation plots between residuals from T2/B and T2/R light curves for the three samples defined above. The best-fit straight line calculated by ordinary least-squares is overplotted. The Spearman rank correlation coefficient is tabulated for each subset, along with the blue and red RMS.