Until 1903.3 generations ago, the population of deme G was 1409. At that point, it changed to 9861, where it has stayed up to now.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 1409
        end_time: 1903.3
      - start_size: 9861
        end_time: 0