R deme's population was steady at 5407 before it decreased to 4316 230.577 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: R
    start_time: .inf
    epochs:
      - start_size: 5407
        end_time: 230.577
      - start_size: 4316
        end_time: 0