Until 5859.0 generations ago, the population of deme M was 9394. At that point, it reduced to 7550, where it has stayed up to now.
time_units: generations
demes:
  - name: M
    start_time: .inf
    epochs:
      - start_size: 9394
        end_time: 5859.0
      - start_size: 7550
        end_time: 0