Until a shift occurred 4436.13 generations ago, deme T's population was consistently 9271. Since then, it changed to 2916, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 9271
        end_time: 4436.13
      - start_size: 2916
        end_time: 0