A deme's population was steady at 6133 before it decreased to 987 7984.0 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: A
    start_time: .inf
    epochs:
      - start_size: 6133
        end_time: 7984.0
      - start_size: 987
        end_time: 0