For deme T, the population count was 1967 until a change 2027.0 generations ago, where it changed to 7065, remaining steady thereafter.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 1967
        end_time: 2027.0
      - start_size: 7065
        end_time: 0