The number of individuals in deme Q remained at 484 until 6460.62 generations ago, at which time it changed to a new stable size of 9252.
time_units: generations
demes:
  - name: Q
    start_time: .inf
    epochs:
      - start_size: 484
        end_time: 6460.62
      - start_size: 9252
        end_time: 0