Originally, deme P had a population size of 5333, which grew to 8740 around 4320.2 generations ago and has not changed since.
time_units: generations
demes:
  - name: P
    start_time: .inf
    epochs:
      - start_size: 5333
        end_time: 4320.2
      - start_size: 8740
        end_time: 0