Up until 9446.21 generations ago, the count of P deme was 4740. Following that period, it reduced to 1605, where it has persisted until now.
time_units: generations
demes:
  - name: P
    start_time: .inf
    epochs:
      - start_size: 4740
        end_time: 9446.21
      - start_size: 1605
        end_time: 0