Deme G maintained a population of 6650 until there was a shift 5532.072 generations ago that decreased its numbers to 4787, a figure that has remained the same since.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 6650
        end_time: 5532.072
      - start_size: 4787
        end_time: 0