X deme's population was steady at 1174 before it changed to 3624 9545.792 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: X
    start_time: .inf
    epochs:
      - start_size: 1174
        end_time: 9545.792
      - start_size: 3624
        end_time: 0