The deme of B kept its population at 1111 until 8903.869 generations ago, when a exponential change ensued until 7953.44, to size 4687. Subsequently, a exponential change changed the numbers to 8857 individuals by 7398.3. Starting from 7398.3, the population has seen a change from 8857 to 3822 at a exponential pace, continuing to this day.
time_units: generations
demes:
  - name: B
    start_time: .inf
    epochs:
      - start_size: 1111
        end_time: 8903.869
      - start_size: 1111
        end_size: 4687
        end_time: 7953.44
        size_function: exponential
      - start_size: 4687
        end_time: 7398.3
        end_size: 8857
        size_function: exponential
      - end_time: 0
        start_size: 8857
        end_size: 3822
        size_function: exponential