time_units: generations
demes:
- name: deme1
  start_time: .inf
  epochs:
  - {end_size: 4.0, end_time: 8.0, start_size: 4.0}
  - {end_size: 0.1, end_time: 4.0, start_size: 0.1}
  - {end_size: 1, end_time: 0, start_size: 1.0}
migrations: []