Deme R had an initial size of 6688 until 3496.0 generations ago. At that time, its population size changed to 9516, and has remained there till current time.
time_units: generations
demes:
  - name: R
    start_time: .inf
    epochs:
      - start_size: 6688
        end_time: 3496.0
      - start_size: 9516
        end_time: 0