Up until 9461.0 generations ago, the count of G deme was 7739. Following that period, it decreased to 4480, where it has persisted until now.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 7739
        end_time: 9461.0
      - start_size: 4480
        end_time: 0