CLM45_halfco2   CLM40_halfco2
    0       5.17      4.80
    1      27.83     41.92
    2      -0.40     -0.68
    3      36.91     41.37
    4       4.24      2.47
    5      32.76     43.57
    6       0.87      0.32
    7      37.25     40.65
    8       0.51      0.79
    9      36.95     35.90
   10      -1.02     -1.08
   11      29.95     41.84
   12      27.99     25.62