Deme O had an initial size of 4594 until 5445.85 generations ago. At that time, its population size decreased to 1496, and has remained there till current time.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 4594
        end_time: 5445.85
      - start_size: 1496
        end_time: 0