The deme of J kept its population at 6225 until 8043.27 generations ago, when a linear decrease ensued until 7199.774, to size 6039. Subsequently, a exponential increase changed the numbers to 8262 individuals by 4657.0. Starting from 4657.0, the population has seen a decrease from 8262 to 4018 at a exponential pace, continuing to this day.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 6225
        end_time: 8043.27
      - start_size: 6225
        end_size: 6039
        end_time: 7199.774
        size_function: linear
      - start_size: 6039
        end_time: 4657.0
        end_size: 8262
        size_function: exponential
      - end_time: 0
        start_size: 8262
        end_size: 4018
        size_function: exponential