time_units: generations
description: test
demes:
- name: d1
  epochs:
  - {start_size: 1000, end_time: 0}
- name: d2
  epochs:
  - {start_size: 1000, end_time: 0}
migrations:
- {rate: 0.0001, source: d1, dest: d2, start_time: 50, end_time: 40}
- {rate: 1e-05, source: d2, dest: d1}