description: Example of a simple line topology graph.
time_units: generations
defaults:
  epoch: {start_size: 1}

demes:
- name: deme0
  epochs:
  - end_time: 20
- name: deme1
  ancestors: [deme0]
  epochs:
  - end_time: 10
- name: deme2
  ancestors: [deme1]