The number of individuals in deme J remained at 7682 until 788.342 generations ago, at which time it changed to a new stable size of 9575.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 7682
        end_time: 788.342
      - start_size: 9575
        end_time: 0