Up until 4566.1 generations ago, the population of D deme was constant at 8867. It then entered a linear phase of change until 4364.0 generations, reaching size 1180. This was succeeded by an exponential phase of change, leading to 4968 by 963.96. From 963.96 generations to present, the population has changed from 4968 to 3580 exponentially.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 8867
        end_time: 4566.1
      - start_size: 8867
        end_size: 1180
        end_time: 4364.0
        size_function: linear
      - start_size: 1180
        end_time: 963.96
        end_size: 4968
        size_function: exponential
      - end_time: 0
        start_size: 4968
        end_size: 3580
        size_function: exponential