Deme M had an initial size of 6704 until 7566.45 generations ago. At that time, its population size changed to 4162, and has remained there till current time.
time_units: generations
demes:
  - name: M
    start_time: .inf
    epochs:
      - start_size: 6704
        end_time: 7566.45
      - start_size: 4162
        end_time: 0