Deme W maintained a population of 5446 until there was a shift 2873.761 generations ago that reduced its numbers to 2276, a figure that has remained the same since.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 5446
        end_time: 2873.761
      - start_size: 2276
        end_time: 0