Until a shift occurred 1862.142 generations ago, deme E's population was consistently 7784. Since then, it changed to 9988, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: E
    start_time: .inf
    epochs:
      - start_size: 7784
        end_time: 1862.142
      - start_size: 9988
        end_time: 0