Deme N maintained a population of 3458 until there was a shift 110.8591 generations ago that changed its numbers to 859, a figure that has remained the same since.
time_units: generations
demes:
  - name: N
    start_time: .inf
    epochs:
      - start_size: 3458
        end_time: 110.8591
      - start_size: 859
        end_time: 0