The number of individuals in deme T remained at 1810 until 6593.7 generations ago, at which time it increased to a new stable size of 9155.
time_units: generations
demes:
  - name: T
    start_time: .inf
    epochs:
      - start_size: 1810
        end_time: 6593.7
      - start_size: 9155
        end_time: 0