For deme P, the population count was 6472 until a change 9009.553 generations ago, where it reduced to 6426, remaining steady thereafter.
time_units: generations
demes:
  - name: P
    start_time: .inf
    epochs:
      - start_size: 6472
        end_time: 9009.553
      - start_size: 6426
        end_time: 0