Up until 9799.0 generations ago, the count of T deme was 7316. Following that period, it changed to 2140, where it has persisted until now.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 7316
        end_time: 9799.0
      - start_size: 2140
        end_time: 0