For deme N, the population count was 5737 until a change 6780.238 generations ago, where it decreased to 1460, remaining steady thereafter.
time_units: generations
demes:
  - name: N
    start_time: .inf
    epochs:
      - start_size: 5737
        end_time: 6780.238
      - start_size: 1460
        end_time: 0