Deme K had an initial size of 4220 until 5544.5 generations ago. At that time, its population size increased to 8837, and has remained there till current time.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 4220
        end_time: 5544.5
      - start_size: 8837
        end_time: 0