Up until 7674.0 generations ago, the count of L deme was 4672. Following that period, it changed to 1685, where it has persisted until now.
time_units: generations
demes:
  - name: L
    start_time: .inf
    epochs:
      - start_size: 4672
        end_time: 7674.0
      - start_size: 1685
        end_time: 0