Initially, the population size of deme D stood at 4341, but this changed 7100.63 generations ago when it changed to 7430, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 4341
        end_time: 7100.63
      - start_size: 7430
        end_time: 0