Run of the median apparent separation on sky of members of CrA-North as a function of time (in the past). The solid line takes into consideration the distance to all other stars in CrA-North; the dashed line only takes into consideration the distance to the closest neighbor. This last has been multiplied by 15 to have a similar vertical scale. The dash-dotted vertical line marks the position of the minimum at 3.72 Myr.