M deme's population was steady at 5752 before it changed to 2454 954.247 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: M
    start_time: .inf
    epochs:
      - start_size: 5752
        end_time: 954.247
      - start_size: 2454
        end_time: 0