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Annual Average
13
TRENDS-OTHER ATMOSPHERIC TRACE GASES
9
April
7
August
7
December
7
February
7
January
7
July
7
June
7
March
7
May
7
November
7
October
7
September
7
Year (1992 - 2001)
7
CH4
6
Month
6
Year
6
atmospheric
6
flask air samples
6
gas chromatography
6
gas detector
6
mercuric oxide reduction
6
methane
6
75 year smoothing spline
3
Atmospheric
3
Atmospheric Hydrogen
3
CH4 measurements
3
CH4 mixing ratio
3
CO
3
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