Until 3285.9791 generations ago, the population of deme G was 8156. At that point, it changed to 3190, where it has stayed up to now.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 8156
        end_time: 3285.9791
      - start_size: 3190
        end_time: 0