Originally, deme Q had a population size of 6415, which changed to 1653 around 2366.0 generations ago and has not changed since.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 6415
        end_time: 2366.0
      - start_size: 1653
        end_time: 0