Q deme's population was steady at 441 before it increased to 4601 3971.7 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 441
        end_time: 3971.7
      - start_size: 4601
        end_time: 0