Deme W had an initial size of 9265 until 4820.0 generations ago. At that time, its population size reduced to 9021, and has remained there till current time.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 9265
        end_time: 4820.0
      - start_size: 9021
        end_time: 0