The number of individuals in deme W remained at 9854 until 2903.627 generations ago, at which time it changed to a new stable size of 5944.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 9854
        end_time: 2903.627
      - start_size: 5944
        end_time: 0