Originally, deme O had a population size of 5928, which changed to 1052 around 3688.26 generations ago and has not changed since.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 5928
        end_time: 3688.26
      - start_size: 1052
        end_time: 0