Up until 8198.154 generations ago, the count of Z deme was 4484. Following that period, it increased to 6056, where it has persisted until now.
time_units: generations
demes:
  - name: Z
    start_time: .inf
    epochs:
      - start_size: 4484
        end_time: 8198.154
      - start_size: 6056
        end_time: 0