Initially, the population size of deme R stood at 4915, but this changed 3688.1527 generations ago when it changed to 6402, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: R
    start_time: .inf
    epochs:
      - start_size: 4915
        end_time: 3688.1527
      - start_size: 6402
        end_time: 0