Figure A2.

This diagram shows how the urn model of parabolic replicators is implemented. (a,b) correspond to the rapid association/dissociation reactions, which are supposed to equilibrate in much shorter time-scales than the replicating process, which is shown in (c), i.e., ${\tau }_0\ll {\tau }_1$. The process of equilibration (left box) is iterated a large number of times before the loop goes into the replication process (right box).