abrupt4xCO2   piControl
    0       5.05      4.79
    1      18.16     31.77
    2      -2.00      0.34
    3      16.80     41.17
    4      -1.37      2.57
    5      30.71     31.61
    6      -1.86      1.15
    7      22.98     34.59
    8       0.22      1.25
    9      19.72     20.32
   10      -2.62     -1.22
   11      11.41     36.88
   12      12.84     21.11