The number of individuals in deme K remained at 1391 until 1959.0 generations ago, at which time it increased to a new stable size of 3024.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 1391
        end_time: 1959.0
      - start_size: 3024
        end_time: 0