Until 9798.5 generations ago, the U deme's population was fixed at 1803. From 9798.5 to 9729.0, it underwent a linear change to 8384 individuals. Then, a exponential reduction brought the count to 3644 by 4563.0. Since then, from 4563.0 generations to the current day, the population has increased from 3644 to 4789 at a exponential rate.
time_units: generations
demes:
  - name: U
    start_time: .inf
    epochs:
      - start_size: 1803
        end_time: 9798.5
      - start_size: 1803
        end_size: 8384
        end_time: 9729.0
        size_function: linear
      - start_size: 8384
        end_time: 4563.0
        end_size: 3644
        size_function: exponential
      - end_time: 0
        start_size: 3644
        end_size: 4789
        size_function: exponential