-0.064        -0.016        -0.004        -0.001    -0.00025
   -0.032        -0.008       -0.002       -0.0005    
 0.00025      0.001         0.004         0.016           0.064
0.0005          0.002        0.008        0.0032         0.128
Monthly Variation of Source/Sink of Carbon