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Figure 2

Figure 2: Average annual atmospheric 14CO2 record for the Northern Hemisphere. Annual averaging smoothes the curve and reduces the 1963 peak.

Figure 2 shows the average annual atmospheric <sup>14</sup>CO<sub>2</sub> record for the Northern Hemisphere14CO2 record for the Northern Hemisphere">
Source: Adapted from Levin and Kromer 2004 and Stuiver et al. 1998a.