The Y deme held its population size constant at 1284 until 9207.0 generations ago, then experienced a linear increase up to 6524 individuals by time 8529.67. This was followed by an exponential change, resulting in 8877 individuals by 6037.89. From 6037.89 generations onward to the present, the population has been on a linear change from 8877 to 1747.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 1284
        end_time: 9207.0
      - start_size: 1284
        end_size: 6524
        end_time: 8529.67
        size_function: linear
      - start_size: 6524
        end_time: 6037.89
        end_size: 8877
        size_function: exponential
      - end_time: 0
        start_size: 8877
        end_size: 1747
        size_function: linear