Initially, the population size of deme B stood at 1167, but this changed 3693.76 generations ago when it changed to 523, and it has been stable at that size up to today.
time_units: generations
demes:
  - name: B
    start_time: .inf
    epochs:
      - start_size: 1167
        end_time: 3693.76
      - start_size: 523
        end_time: 0