297_4xCO2   297_4xCO2_to_PI_yr200
    0       4.68      4.66
    1      22.56     26.35
    2      -1.23     -0.36
    3      20.36     31.24
    4      -0.13      1.60
    5      24.76     26.10
    6      -0.74      0.14
    7      19.19     21.00
    8       0.42      0.84
    9      17.00     17.11
   10      -2.42     -1.74
   11      17.24     28.05
   12      18.38     19.61