Until 4323.8062 generations ago, the J deme's population was fixed at 1369. From 4323.8062 to 2839.7893, it underwent a linear growth to 5374 individuals. Then, a exponential decrease brought the count to 3069 by 1454.481. Since then, from 1454.481 generations to the current day, the population has reduced from 3069 to 1309 at a exponential rate.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 1369
        end_time: 4323.8062
      - start_size: 1369
        end_size: 5374
        end_time: 2839.7893
        size_function: linear
      - start_size: 5374
        end_time: 1454.481
        end_size: 3069
        size_function: exponential
      - end_time: 0
        start_size: 3069
        end_size: 1309
        size_function: exponential