The O deme had a size of 9312 until 2145.0 generations ago. From 2145.0 generations to time 1831.906, its size changed linearly to 7931 individuals. After that, until 250.6, the population had a linear change to 1891 individuals. It then changed from 1891 to 4841, starting 250.6 generations ago, until current times, at a linear rate.
time_units: generations
demes:
  - name: O
    start_time: .inf
    epochs:
      - start_size: 9312
        end_time: 2145.0
      - start_size: 9312
        end_size: 7931
        end_time: 1831.906
        size_function: linear
      - start_size: 7931
        end_time: 250.6
        end_size: 1891
        size_function: linear
      - end_time: 0
        start_size: 1891
        end_size: 4841
        size_function: linear