Deme K had an initial size of 255 until 4700.682 generations ago. At that time, its population size increased to 9459, and has remained there till current time.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 255
        end_time: 4700.682
      - start_size: 9459
        end_time: 0