Up until 2457.0 generations ago, the count of C deme was 6970. Following that period, it reduced to 5234, where it has persisted until now.
time_units: generations
demes:
  - name: C
    start_time: .inf
    epochs:
      - start_size: 6970
        end_time: 2457.0
      - start_size: 5234
        end_time: 0