Initially, the population size of deme W stood at 6712, but this changed 6085.7777 generations ago when it increased to 8426, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 6712
        end_time: 6085.7777
      - start_size: 8426
        end_time: 0