Up until 1997.417 generations ago, the count of N deme was 5358. Following that period, it changed to 7290, where it has persisted until now.
time_units: generations
demes:
  - name: N
    start_time: .inf
    epochs:
      - start_size: 5358
        end_time: 1997.417
      - start_size: 7290
        end_time: 0