Until a shift occurred 2604.9 generations ago, deme W's population was consistently 1421. Since then, it grew to 5294, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 1421
        end_time: 2604.9
      - start_size: 5294
        end_time: 0