Until 5443.3 generations ago, the Y deme's population was fixed at 6174. From 5443.3 to 3005.7111, it underwent a exponential change to 6202 individuals. Then, a exponential decrease brought the count to 3583 by 932.76. Since then, from 932.76 generations to the current day, the population has changed from 3583 to 8295 at a exponential rate.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 6174
        end_time: 5443.3
      - start_size: 6174
        end_size: 6202
        end_time: 3005.7111
        size_function: exponential
      - start_size: 6202
        end_time: 932.76
        end_size: 3583
        size_function: exponential
      - end_time: 0
        start_size: 3583
        end_size: 8295
        size_function: exponential