${\text{DWD}}_3^{*}$ systems (population B). Initial and final a (empty green circles and filled points) of system 221–230 (on the vertical axis, top panel) and system 341–350 (on the vertical axis, bottom panel). Each point represents a planet, and its size is proportional to the planetary mass. The color map gives a measure of the degree of stability. In some systems, the green circles overlap the filled points.