Deme Q had an initial size of 6611 until 2255.56 generations ago. At that time, its population size changed to 3992, and has remained there till current time.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 6611
        end_time: 2255.56
      - start_size: 3992
        end_time: 0