Deme E maintained a population of 6506 until there was a shift 8912.943 generations ago that changed its numbers to 1559, a figure that has remained the same since.
time_units: generations
demes:
  - name: E
    start_time: .inf
    epochs:
      - start_size: 6506
        end_time: 8912.943
      - start_size: 1559
        end_time: 0