The deme of O kept its population at 571 until 8345.6 generations ago, when a linear change ensued until 4354.18, to size 4509. Subsequently, a exponential change changed the numbers to 1407 individuals by 2074.17. Starting from 2074.17, the population has seen a change from 1407 to 8119 at a linear pace, continuing to this day.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 571
        end_time: 8345.6
      - start_size: 571
        end_size: 4509
        end_time: 4354.18
        size_function: linear
      - start_size: 4509
        end_time: 2074.17
        end_size: 1407
        size_function: exponential
      - end_time: 0
        start_size: 1407
        end_size: 8119
        size_function: linear