The deme of U kept its population at 6318 until 5100.5876 generations ago, when a exponential reduction ensued until 4578.652, to size 2180. Subsequently, a linear growth changed the numbers to 2958 individuals by 3676.0. Starting from 3676.0, the population has seen a increase from 2958 to 6450 at a exponential pace, continuing to this day.
time_units: generations
demes:
  - name: U
    start_time: .inf
    epochs:
      - start_size: 6318
        end_time: 5100.5876
      - start_size: 6318
        end_size: 2180
        end_time: 4578.652
        size_function: exponential
      - start_size: 2180
        end_time: 3676.0
        end_size: 2958
        size_function: linear
      - end_time: 0
        start_size: 2958
        end_size: 6450
        size_function: exponential