Up until 2272.5411 generations ago, the count of K deme was 3474. Following that period, it changed to 6524, where it has persisted until now.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 3474
        end_time: 2272.5411
      - start_size: 6524
        end_time: 0