Fig. 3
From: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE
COSMIC gradient. The 14C content of individual tree-ring site records averaged over 11-year intervals from 770–780 and 990–1000 CE. Horizontal lines indicate atmospheric radiocarbon zones17. Grey lines are standard errors of the tree-ring site records. Linear trends within the NH and across both hemispheres are R2 = 0.29 and 0.71, respectively (not shown)
