Z deme's population was steady at 6900 before it changed to 6359 2346.2 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: Z
    start_time: .inf
    epochs:
      - start_size: 6900
        end_time: 2346.2
      - start_size: 6359
        end_time: 0