Initially, the population size of deme O stood at 509, but this changed 2276.42 generations ago when it grew to 7453, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 509
        end_time: 2276.42
      - start_size: 7453
        end_time: 0