Until 4668.491 generations ago, the population of deme V was 300. At that point, it changed to 6711, where it has stayed up to now.
time_units: generations
demes:
  - name: V
    start_time: .inf
    epochs:
      - start_size: 300
        end_time: 4668.491
      - start_size: 6711
        end_time: 0