Deme K maintained a population of 6005 until there was a shift 3614.24 generations ago that grew its numbers to 6431, a figure that has remained the same since.
time_units: generations
demes:
  - name: K
    start_time: .inf
    epochs:
      - start_size: 6005
        end_time: 3614.24
      - start_size: 6431
        end_time: 0