The number of individuals in deme A remained at 1624 until 224.5757 generations ago, at which time it changed to a new stable size of 5391.
time_units: generations
demes:
  - name: A
    start_time: .inf
    epochs:
      - start_size: 1624
        end_time: 224.5757
      - start_size: 5391
        end_time: 0