Deme H maintained a population of 5191 until there was a shift 3742.3607 generations ago that decreased its numbers to 484, a figure that has remained the same since.
time_units: generations
demes:
  - name: H
    start_time: .inf
    epochs:
      - start_size: 5191
        end_time: 3742.3607
      - start_size: 484
        end_time: 0