time_units: generations
demes:
- name: deme1
  start_time: .inf
  epochs:
  - {end_size: 1.9287498479639178e-20, end_time: 4000.0, start_size: 1.9287498479639178e-20}
  - {end_size: 100, end_time: 0, start_size: 1.9287498479639178e-20}
migrations: []