Initially, the population size of deme R stood at 862, but this changed 3025.3 generations ago when it changed to 9652, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: R
    start_time: .inf
    epochs:
      - start_size: 862
        end_time: 3025.3
      - start_size: 9652
        end_time: 0