Until a shift occurred 7420.13 generations ago, deme F's population was consistently 5010. Since then, it grew to 6131, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: F
    start_time: .inf
    epochs:
      - start_size: 5010
        end_time: 7420.13
      - start_size: 6131
        end_time: 0