Originally, deme Q had a population size of 3328, which changed to 9108 around 215.029 generations ago and has not changed since.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 3328
        end_time: 215.029
      - start_size: 9108
        end_time: 0