Iron cross-correlation trail maps for HARPS optical data exhibiting non-negligible stellar contamination (i.e. Rossiter-McLaughlin effect) at the systemic velocity expected from Delrez et al. (2016). Dashed yellow lines define the transit window. The solid red line illustrates the Keplerian curve (i.e. the planet’s orbital motion). Panel (a) shows the HARPS optical data not corrected for the stellar contamination as Doppler shadow, while panel (b) shows the Doppler shadow masked (corresponding flux values are set to NaN and discarded).