The deme of J kept its population at 8969 until 8036.21 generations ago, when a linear decrease ensued until 8029.584, to size 4257. Subsequently, a exponential decrease changed the numbers to 2571 individuals by 4797.53. Starting from 4797.53, the population has seen a change from 2571 to 6188 at a linear pace, continuing to this day.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 8969
        end_time: 8036.21
      - start_size: 8969
        end_size: 4257
        end_time: 8029.584
        size_function: linear
      - start_size: 4257
        end_time: 4797.53
        end_size: 2571
        size_function: exponential
      - end_time: 0
        start_size: 2571
        end_size: 6188
        size_function: linear