# Comments start with a hash.
description:
  Asymmetric migration between two extant demes.
time_units: generations
defaults:
  epoch:
    start_size: 5000
demes:
  - name: X
    epochs:
      - end_time: 1000
  - name: A
    ancestors: [X]
  - name: B
    ancestors: [X]
    epochs:
      - start_size: 2000
        end_time: 500
      - start_size: 400
        end_size: 10000
migrations:
  - source: A
    dest: B
    rate: 1e-4