The number of individuals in deme Q remained at 7072 until 2273.4562 generations ago, at which time it changed to a new stable size of 3983.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 7072
        end_time: 2273.4562
      - start_size: 3983
        end_time: 0