Until a shift occurred 739.673 generations ago, deme K's population was consistently 6163. Since then, it reduced to 4493, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 6163
        end_time: 739.673
      - start_size: 4493
        end_time: 0