For deme T, the population count was 417 until a change 5564.24 generations ago, where it changed to 371, remaining steady thereafter.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 417
        end_time: 5564.24
      - start_size: 371
        end_time: 0