Initially, the population size of deme F stood at 6367, but this changed 271.0 generations ago when it decreased to 1742, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: F
    start_time: .inf
    epochs:
      - start_size: 6367
        end_time: 271.0
      - start_size: 1742
        end_time: 0