Up until 3723.962 generations ago, the count of M deme was 2979. Following that period, it changed to 8297, where it has persisted until now.
time_units: generations
demes:
  - name: M
    start_time: .inf
    epochs:
      - start_size: 2979
        end_time: 3723.962
      - start_size: 8297
        end_time: 0