Combined DC of the Ca ii H and K lines wings along with our best-fit second order polynomial model (dashed) and our best-fit model including the synthetic DC. The bottom panel gives the residuals with respect to our DC model. The solid (red) line shows the residuals smoothed by a running mean with a width of eight data points. The vertical lines indicate the transit duration and the three top bars indicate the phase intervals used in the analysis of the spectra.