For the O deme, the population size remained at 9937 until 6917.278 generations ago, at which point a exponential change took place until 6291.0 generations for size 8405. Afterward, the population saw an linear reduction to 6690 by 5858.0. From 5858.0 generations ago to today, there's been a exponential growth from 6690 to 8364.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 9937
        end_time: 6917.278
      - start_size: 9937
        end_size: 8405
        end_time: 6291.0
        size_function: exponential
      - start_size: 8405
        end_time: 5858.0
        end_size: 6690
        size_function: linear
      - end_time: 0
        start_size: 6690
        end_size: 8364
        size_function: exponential