abrupt4xCO2   piControl
    0       2.16      0.84
    1       4.03     46.64
    2       1.68     -0.04
    3      13.05     53.77
    4       1.48     -0.06
    5      11.27     51.87
    6       1.47     -0.18
    7      16.04     49.11
    8       1.93     -0.02
    9      14.09     52.33
   10       1.81      0.06
   11      10.67     52.41
   12       8.54      8.29