Originally, deme T had a population size of 941, which changed to 4138 around 6382.64 generations ago and has not changed since.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 941
        end_time: 6382.64
      - start_size: 4138
        end_time: 0