Until 6387.0 generations ago, the J deme's population was fixed at 1912. From 6387.0 to 3527.5, it underwent a exponential growth to 6248 individuals. Then, a exponential reduction brought the count to 3074 by 2112.53. Since then, from 2112.53 generations to the current day, the population has changed from 3074 to 3969 at a linear rate.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 1912
        end_time: 6387.0
      - start_size: 1912
        end_size: 6248
        end_time: 3527.5
        size_function: exponential
      - start_size: 6248
        end_time: 2112.53
        end_size: 3074
        size_function: exponential
      - end_time: 0
        start_size: 3074
        end_size: 3969
        size_function: linear