The deme of J kept its population at 4410 until 4333.36 generations ago, when a linear reduction ensued until 1935.2, to size 1860. Subsequently, a exponential growth changed the numbers to 3181 individuals by 1795.554. Starting from 1795.554, the population has seen a change from 3181 to 8898 at a exponential pace, continuing to this day.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 4410
        end_time: 4333.36
      - start_size: 4410
        end_size: 1860
        end_time: 1935.2
        size_function: linear
      - start_size: 1860
        end_time: 1795.554
        end_size: 3181
        size_function: exponential
      - end_time: 0
        start_size: 3181
        end_size: 8898
        size_function: exponential