For deme N, the population count was 7222 until a change 3212.1947 generations ago, where it decreased to 431, remaining steady thereafter.
time_units: generations
demes:
  - name: N
    start_time: .inf
    epochs:
      - start_size: 7222
        end_time: 3212.1947
      - start_size: 431
        end_time: 0