Superposed epoch profile of the magnetic field (B and components) in FR frame with the Lepping orientation, and the plasma velocity (at the bottom). The profiles were computed using the mean (black) or the median (red) of the selected MCs (Q_best sample) in each temporal bin. The grey bands show the standard deviation of the mean. The MC region is shown with a blue background. The dashed line in the upper plot corresponds to B = 6 nT associated with the ambient solar wind. The time is normalised by the MC duration (t_start = 0, t_end = 1).