Deme W maintained a population of 5784 until there was a shift 526.0 generations ago that changed its numbers to 2787, a figure that has remained the same since.
time_units: generations
demes:
  - name: W
    start_time: .inf
    epochs:
      - start_size: 5784
        end_time: 526.0
      - start_size: 2787
        end_time: 0