The deme of F kept its population at 9031 until 6649.9 generations ago, when a linear reduction ensued until 3976.7454, to size 686. Subsequently, a exponential change changed the numbers to 9327 individuals by 342.78. Starting from 342.78, the population has seen a change from 9327 to 3193 at a linear pace, continuing to this day.
time_units: generations
demes:
  - name: F
    start_time: .inf
    epochs:
      - start_size: 9031
        end_time: 6649.9
      - start_size: 9031
        end_size: 686
        end_time: 3976.7454
        size_function: linear
      - start_size: 686
        end_time: 342.78
        end_size: 9327
        size_function: exponential
      - end_time: 0
        start_size: 9327
        end_size: 3193
        size_function: linear