The number of individuals in deme E remained at 541 until 2201.3991 generations ago, at which time it changed to a new stable size of 6018.
time_units: generations
demes:
  - name: E
    start_time: .inf
    epochs:
      - start_size: 541
        end_time: 2201.3991
      - start_size: 6018
        end_time: 0