Mon  Mean WWV (m**3) Std Deviation
 1   1.68630147E+15  6.89917919E+13
 2   1.6959222E+15   6.83626547E+13
 3   1.70784489E+15  6.4299364E+13
 4   1.69905604E+15  5.74858052E+13
 5   1.67116815E+15  5.15555165E+13
 6   1.64103412E+15  4.74245423E+13
 7   1.62436039E+15  4.6738392E+13
 8   1.62713319E+15  4.73539983E+13
 9   1.64323744E+15  4.78371738E+13
10   1.66967001E+15  5.00754012E+13
11   1.69321328E+15  5.60192207E+13
12   1.69139597E+15  6.37303102E+13