For deme K, the population count was 3903 until a change 8119.936 generations ago, where it changed to 3933, remaining steady thereafter.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 3903
        end_time: 8119.936
      - start_size: 3933
        end_time: 0