Histograms showing the mean value of the time-percentage of BDE for each sector during all the ICMEs transits catalogued in the ICME list, with shock at the beginning (top) and without (bottom). The colours show the different catalogued regions (see text for more details) and the labels correspond to equi-timed periods of the transit of those regions (S – sheath, MO – magnetic obstacle, P – post-ICME). The error bars indicate the standard error of the mean.