Until 1800.8969 generations ago, the population of deme E was 947. At that point, it changed to 3595, where it has stayed up to now.
time_units: generations
demes:
  - name: E
    start_time: .inf
    epochs:
      - start_size: 947
        end_time: 1800.8969
      - start_size: 3595
        end_time: 0