Deme X had an initial size of 4965 until 9713.5137 generations ago. At that time, its population size changed to 9588, and has remained there till current time.
time_units: generations
demes:
  - name: X
    start_time: .inf
    epochs:
      - start_size: 4965
        end_time: 9713.5137
      - start_size: 9588
        end_time: 0