Deme D maintained a population of 3277 until there was a shift 9824.4064 generations ago that changed its numbers to 5451, a figure that has remained the same since.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 3277
        end_time: 9824.4064
      - start_size: 5451
        end_time: 0