Up until 6560.689 generations ago, the population of Y deme was constant at 1845. It then entered a linear phase of reduction until 3665.8 generations, reaching size 1811. This was succeeded by an exponential phase of growth, leading to 5955 by 2287.0. From 2287.0 generations to present, the population has changed from 5955 to 6772 exponentially.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 1845
        end_time: 6560.689
      - start_size: 1845
        end_size: 1811
        end_time: 3665.8
        size_function: linear
      - start_size: 1811
        end_time: 2287.0
        end_size: 5955
        size_function: exponential
      - end_time: 0
        start_size: 5955
        end_size: 6772
        size_function: exponential