Up until 1177.6334 generations ago, the count of D deme was 5784. Following that period, it grew to 6938, where it has persisted until now.
time_units: generations
demes:
  - name: D
    start_time: .inf
    epochs:
      - start_size: 5784
        end_time: 1177.6334
      - start_size: 6938
        end_time: 0