Up until 8254.46 generations ago, the count of W deme was 7212. Following that period, it decreased to 3784, where it has persisted until now.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 7212
        end_time: 8254.46
      - start_size: 3784
        end_time: 0