Until 8569.0 generations ago, the population of deme C was 5309. At that point, it changed to 7745, where it has stayed up to now.
time_units: generations
demes:
  - name: C
    start_time: .inf
    epochs:
      - start_size: 5309
        end_time: 8569.0
      - start_size: 7745
        end_time: 0