Originally, deme K had a population size of 6068, which changed to 4969 around 6960.348 generations ago and has not changed since.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 6068
        end_time: 6960.348
      - start_size: 4969
        end_time: 0