M deme's population was steady at 1920 before it increased to 4514 5831.0257 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: M
    start_time: .inf
    epochs:
      - start_size: 1920
        end_time: 5831.0257
      - start_size: 4514
        end_time: 0