CLM45_halfco2   CLM40_halfco2
    0       1.87      1.28
    1       3.40     21.72
    2      -1.48     -0.76
    3       2.76     23.90
    4      -1.20     -0.53
    5       3.43     18.44
    6      -1.37     -0.63
    7       4.10     21.74
    8      -1.97     -1.27
    9       9.49     29.62
   10      -1.36     -0.62
   11       3.44     20.89
   12      49.41     49.14