Initially, the population size of deme J stood at 2076, but this changed 3670.98 generations ago when it grew to 7100, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: J
    start_time: .inf
    epochs:
      - start_size: 2076
        end_time: 3670.98
      - start_size: 7100
        end_time: 0