For deme C, the population count was 4170 until a change 8907.6 generations ago, where it reduced to 2376, remaining steady thereafter.
time_units: generations
demes:
  - name: C
    start_time: .inf
    epochs:
      - start_size: 4170
        end_time: 8907.6
      - start_size: 2376
        end_time: 0