The population size of Y deme stood at 4178 until a shift at 5821.98 generations ago, leading to a linear change up to 4361.48 generations and 4508 individuals. Following this, there was an exponential reduction to 1248 individuals by 2736.2. Since 2736.2, the population has seen a linear changed from 1248 to 4067, continuing to the current time.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 4178
        end_time: 5821.98
      - start_size: 4178
        end_size: 4508
        end_time: 4361.48
        size_function: linear
      - start_size: 4508
        end_time: 2736.2
        end_size: 1248
        size_function: exponential
      - end_time: 0
        start_size: 1248
        end_size: 4067
        size_function: linear