Initially, the population size of deme G stood at 246, but this changed 6981.4 generations ago when it changed to 6209, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: G
    start_time: .inf
    epochs:
      - start_size: 246
        end_time: 6981.4
      - start_size: 6209
        end_time: 0