The number of individuals in deme P remained at 7891 until 2102.4 generations ago, at which time it changed to a new stable size of 1591.
time_units: generations
demes:
  - name: P
    start_time: .inf
    epochs:
      - start_size: 7891
        end_time: 2102.4
      - start_size: 1591
        end_time: 0