Until a shift occurred 6480.591 generations ago, deme V's population was consistently 4749. Since then, it changed to 2451, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: V
    start_time: .inf
    epochs:
      - start_size: 4749
        end_time: 6480.591
      - start_size: 2451
        end_time: 0