Until 6617.0 generations ago, the U deme's population was fixed at 5219. From 6617.0 to 5747.48, it underwent a linear change to 1823 individuals. Then, a linear growth brought the count to 5825 by 848.773. Since then, from 848.773 generations to the current day, the population has changed from 5825 to 5428 at a exponential rate.
time_units: generations
demes:
  - name: U
    start_time: .inf
    epochs:
      - start_size: 5219
        end_time: 6617.0
      - start_size: 5219
        end_size: 1823
        end_time: 5747.48
        size_function: linear
      - start_size: 1823
        end_time: 848.773
        end_size: 5825
        size_function: linear
      - end_time: 0
        start_size: 5825
        end_size: 5428
        size_function: exponential