For the D deme, the population size remained at 1783 until 8366.3278 generations ago, at which point a exponential change took place until 7526.959 generations for size 964. Afterward, the population saw an exponential growth to 2850 by 4385.535. From 4385.535 generations ago to today, there's been a linear change from 2850 to 5828.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 1783
        end_time: 8366.3278
      - start_size: 1783
        end_size: 964
        end_time: 7526.959
        size_function: exponential
      - start_size: 964
        end_time: 4385.535
        end_size: 2850
        size_function: exponential
      - end_time: 0
        start_size: 2850
        end_size: 5828
        size_function: linear