This article has an erratum: [https://doi.org/10.1051/swsc/2021028]
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Asymptotic viewing directions of the GMDN and MD + NM at Syowa Station. Each small symbol shows the asymptotic direction of primary GCR having the median primary rigidity (Pm) observed in each directional channel of GMDN and Syowa MD. Each large solid symbol indicates the viewing direction of the vertical channel in each MD, while a large cross symbol indicates a viewing direction of Syowa NM. The track through each solid symbol represents the spread of viewing directions corresponding to the central 80% of the rigidity response.
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