Q deme's population was steady at 2981 before it changed to 5574 1335.2386 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 2981
        end_time: 1335.2386
      - start_size: 5574
        end_time: 0