The Y deme held its population size constant at 9973 until 7524.6 generations ago, then experienced a linear change up to 6002 individuals by time 6625.471. This was followed by an exponential change, resulting in 9736 individuals by 900.9565. From 900.9565 generations onward to the present, the population has been on a linear decrease from 9736 to 4921.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 9973
        end_time: 7524.6
      - start_size: 9973
        end_size: 6002
        end_time: 6625.471
        size_function: linear
      - start_size: 6002
        end_time: 900.9565
        end_size: 9736
        size_function: exponential
      - end_time: 0
        start_size: 9736
        end_size: 4921
        size_function: linear