The Y deme held its population size constant at 4681 until 8874.3699 generations ago, then experienced a exponential increase up to 6417 individuals by time 3417.8. This was followed by an exponential increase, resulting in 8869 individuals by 2402.433. From 2402.433 generations onward to the present, the population has been on a exponential reduction from 8869 to 5654.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 4681
        end_time: 8874.3699
      - start_size: 4681
        end_size: 6417
        end_time: 3417.8
        size_function: exponential
      - start_size: 6417
        end_time: 2402.433
        end_size: 8869
        size_function: exponential
      - end_time: 0
        start_size: 8869
        end_size: 5654
        size_function: exponential