Originally, deme P had a population size of 1824, which grew to 8668 around 6438.959 generations ago and has not changed since.
time_units: generations
demes:
  - name: P
    start_time: .inf
    epochs:
      - start_size: 1824
        end_time: 6438.959
      - start_size: 8668
        end_time: 0