abrupt4xCO2   piControl
    0       2.53      1.50
    1       5.94     40.65
    2       1.41     -0.46
    3      15.01     46.52
    4       0.98     -0.32
    5       8.82     26.97
    6       1.53     -0.43
    7      13.49     46.14
    8       2.04     -0.60
    9      18.50     46.21
   10       1.06     -0.49
   11      13.29     37.52
   12      36.32     41.01