Originally, deme H had a population size of 7455, which changed to 6504 around 5022.139 generations ago and has not changed since.
time_units: generations
demes:
  - name: H
    start_time: .inf
    epochs:
      - start_size: 7455
        end_time: 5022.139
      - start_size: 6504
        end_time: 0