Until a shift occurred 5704.742 generations ago, deme E's population was consistently 209. Since then, it changed to 8235, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: E
    start_time: .inf
    epochs:
      - start_size: 209
        end_time: 5704.742
      - start_size: 8235
        end_time: 0