Initially, the population size of deme J stood at 8117, but this changed 2367.9136 generations ago when it changed to 3677, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 8117
        end_time: 2367.9136
      - start_size: 3677
        end_time: 0