The number of individuals in deme Z remained at 7348 until 16.8978 generations ago, at which time it reduced to a new stable size of 1753.
time_units: generations
demes:
  - name: Z
    start_time: .inf
    epochs:
      - start_size: 7348
        end_time: 16.8978
      - start_size: 1753
        end_time: 0