For deme S, the population count was 7690 until a change 2415.0605 generations ago, where it decreased to 3119, remaining steady thereafter.
time_units: generations
demes:
  - name: S
    start_time: .inf
    epochs:
      - start_size: 7690
        end_time: 2415.0605
      - start_size: 3119
        end_time: 0