Originally, deme W had a population size of 6433, which increased to 7865 around 1337.801 generations ago and has not changed since.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 6433
        end_time: 1337.801
      - start_size: 7865
        end_time: 0