Fig. 1
Wolf sunspot number (WSN, panel a)), group sunspot number (GSN, panel b)), and sunspot number reconstructions (SNR) based on dendrochronologically dated radiocarbon concentrations (panel c)). Black and red lines in panel c) refer to the sunspot number reconstructions obtained by Solanki et al. (SNR04, 2004) and Usoskin et al. (SNR14, 2014), respectively. See the text for details.
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