Until 8436.4101 generations ago, the B deme's population was fixed at 3766. From 8436.4101 to 4356.5758, it underwent a exponential reduction to 3187 individuals. Then, a exponential reduction brought the count to 3118 by 737.629. Since then, from 737.629 generations to the current day, the population has changed from 3118 to 4579 at a exponential rate.
time_units: generations
demes:
  - name: B
    start_time: .inf
    epochs:
      - start_size: 3766
        end_time: 8436.4101
      - start_size: 3766
        end_size: 3187
        end_time: 4356.5758
        size_function: exponential
      - start_size: 3187
        end_time: 737.629
        end_size: 3118
        size_function: exponential
      - end_time: 0
        start_size: 3118
        end_size: 4579
        size_function: exponential