Initially, the J deme's population count was 8131 until 6140.0 generations ago, at which point it began a linear decrease until reaching size 2800 in 4990.59 generations. Post this phase, the deme experienced an exponential reduction to 1660 individuals by 942.5. From 942.5 generations ago to today, the number of individuals has changed from 1660 to 4990 at a exponential growth rate.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 8131
        end_time: 6140.0
      - start_size: 8131
        end_size: 2800
        end_time: 4990.59
        size_function: linear
      - start_size: 2800
        end_time: 942.5
        end_size: 1660
        size_function: exponential
      - end_time: 0
        start_size: 1660
        end_size: 4990
        size_function: exponential