For the O deme, the population size remained at 3499 until 3506.0 generations ago, at which point a exponential increase took place until 3347.0 generations for size 6938. Afterward, the population saw an linear change to 3911 by 2914.7597. From 2914.7597 generations ago to today, there's been a linear reduction from 3911 to 3628.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 3499
        end_time: 3506.0
      - start_size: 3499
        end_size: 6938
        end_time: 3347.0
        size_function: exponential
      - start_size: 6938
        end_time: 2914.7597
        end_size: 3911
        size_function: linear
      - end_time: 0
        start_size: 3911
        end_size: 3628
        size_function: linear