Originally, deme Q had a population size of 7279, which reduced to 3463 around 6648.567 generations ago and has not changed since.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 7279
        end_time: 6648.567
      - start_size: 3463
        end_time: 0