Until a shift occurred 6521.1 generations ago, deme V's population was consistently 4428. Since then, it changed to 4755, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: V
    start_time: .inf
    epochs:
      - start_size: 4428
        end_time: 6521.1
      - start_size: 4755
        end_time: 0