C deme's population was steady at 1830 before it increased to 5355 5642.1 generations ago, maintaining that number to the present.
time_units: generations
demes:
  - name: C
    start_time: .inf
    epochs:
      - start_size: 1830
        end_time: 5642.1
      - start_size: 5355
        end_time: 0