Up until 3037.0 generations ago, the count of S deme was 2904. Following that period, it increased to 8090, where it has persisted until now.
time_units: generations
demes:
  - name: S
    start_time: .inf
    epochs:
      - start_size: 2904
        end_time: 3037.0
      - start_size: 8090
        end_time: 0