Originally, deme Z had a population size of 7108, which increased to 7896 around 5960.3826 generations ago and has not changed since.
time_units: generations
demes:
  - name: Z
    start_time: .inf
    epochs:
      - start_size: 7108
        end_time: 5960.3826
      - start_size: 7896
        end_time: 0