Deme D maintained a population of 2875 until there was a shift 562.58 generations ago that changed its numbers to 7884, a figure that has remained the same since.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 2875
        end_time: 562.58
      - start_size: 7884
        end_time: 0