Deme Y maintained a population of 5061 until there was a shift 8097.2566 generations ago that grew its numbers to 8056, a figure that has remained the same since.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 5061
        end_time: 8097.2566
      - start_size: 8056
        end_time: 0