B deme's population was steady at 9585 before it changed to 2847 3233.0 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: B
    start_time: .inf
    epochs:
      - start_size: 9585
        end_time: 3233.0
      - start_size: 2847
        end_time: 0