Deme R maintained a population of 5233 until there was a shift 8609.41 generations ago that grew its numbers to 8470, a figure that has remained the same since.
time_units: generations
demes:
  - name: R
    start_time: .inf
    epochs:
      - start_size: 5233
        end_time: 8609.41
      - start_size: 8470
        end_time: 0