Originally, deme T had a population size of 8039, which decreased to 4089 around 4563.2266 generations ago and has not changed since.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 8039
        end_time: 4563.2266
      - start_size: 4089
        end_time: 0