F deme's population was steady at 1035 before it changed to 8526 9347.23 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: F
    start_time: .inf
    epochs:
      - start_size: 1035
        end_time: 9347.23
      - start_size: 8526
        end_time: 0