Until a shift occurred 1443.7 generations ago, deme X's population was consistently 1825. Since then, it increased to 2910, a number that has remained unchanged to the current time.
time_units: generations
demes:
  - name: X
    start_time: .inf
    epochs:
      - start_size: 1825
        end_time: 1443.7
      - start_size: 2910
        end_time: 0