Deme E maintained a population of 254 until there was a shift 3255.4147 generations ago that changed its numbers to 8833, a figure that has remained the same since.
time_units: generations
demes:
  - name: E
    start_time: .inf
    epochs:
      - start_size: 254
        end_time: 3255.4147
      - start_size: 8833
        end_time: 0