The population of deme N held at 5928 until 9791.71 generations back, when it changed reaching 6861, which has been constant since then.
time_units: generations
demes:
  - name: N
    start_time: .inf
    epochs:
      - start_size: 5928
        end_time: 9791.71
      - start_size: 6861
        end_time: 0