Up until 2046.4 generations ago, the count of T deme was 9510. Following that period, it decreased to 5004, where it has persisted until now.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 9510
        end_time: 2046.4
      - start_size: 5004
        end_time: 0