For deme G, the population count was 9500 until a change 2667.3 generations ago, where it decreased to 3093, remaining steady thereafter.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 9500
        end_time: 2667.3
      - start_size: 3093
        end_time: 0