Until a shift occurred 9622.84 generations ago, deme A's population was consistently 1095. Since then, it grew to 5427, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: A
    start_time: .inf
    epochs:
      - start_size: 1095
        end_time: 9622.84
      - start_size: 5427
        end_time: 0