Originally, deme H had a population size of 4979, which changed to 638 around 9430.23 generations ago and has not changed since.
time_units: generations
demes:
  - name: H
    start_time: .inf
    epochs:
      - start_size: 4979
        end_time: 9430.23
      - start_size: 638
        end_time: 0