Up until 740.85 generations ago, the count of W deme was 4596. Following that period, it reduced to 3250, where it has persisted until now.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 4596
        end_time: 740.85
      - start_size: 3250
        end_time: 0