Until 6191.3 generations ago, the population of deme L was 4194. At that point, it increased to 7647, where it has stayed up to now.
time_units: generations
demes:
  - name: L
    start_time: .inf
    epochs:
      - start_size: 4194
        end_time: 6191.3
      - start_size: 7647
        end_time: 0