Initially, the population size of deme D stood at 1198, but this changed 493.8 generations ago when it increased to 9800, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 1198
        end_time: 493.8
      - start_size: 9800
        end_time: 0