  Selectivity is an important phenomenon in chemical reaction dynamics. This
can be quantified by the branching ratio of the trajectories that visit one or
the other wells to the total number of trajectories in a system with a
potential with two sequential index-1 saddles and two wells (top well and
bottom well). In our case, the branching ratio is 1:1 because of the symmetry
of our potential energy surface. The mechanisms of transport and the behavior
of the trajectories in this kind of systems have been studied recently. In this
paper we study the time evolution after the selectivity as energy varies using
periodic orbit dividing surfaces. We investigate what happens after the first
visit of a trajectory to the region of the top or the bottom well for different
values of energy. We answer the natural question, what is the destiny of these
trajectories?
