For deme G, the population count was 6110 until a change 1933.239 generations ago, where it changed to 3584, remaining steady thereafter.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 6110
        end_time: 1933.239
      - start_size: 3584
        end_time: 0