Originally, deme O had a population size of 1815, which increased to 7909 around 9752.365 generations ago and has not changed since.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 1815
        end_time: 9752.365
      - start_size: 7909
        end_time: 0