Until a shift occurred 7289.1186 generations ago, deme A's population was consistently 9671. Since then, it reduced to 9224, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: A
    start_time: .inf
    epochs:
      - start_size: 9671
        end_time: 7289.1186
      - start_size: 9224
        end_time: 0