Until 9983.8313 generations ago, the population of deme U was 2478. At that point, it increased to 9166, where it has stayed up to now.
time_units: generations
demes:
  - name: U
    start_time: .inf
    epochs:
      - start_size: 2478
        end_time: 9983.8313
      - start_size: 9166
        end_time: 0