Deme D had an initial size of 9772 until 1177.598 generations ago. At that time, its population size changed to 4763, and has remained there till current time.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 9772
        end_time: 1177.598
      - start_size: 4763
        end_time: 0