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Research Article

Fig. A.1

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The left panel shows a scatter plot of the the daily mean aa index agaisnt the daily sunspot number, R. The black dots show all values, while those in red mark values with R > 400. The right hand panel shows the ECDF of all aa values in black, of the aa values corresponding to R > 400 in red, and for 100 bootstrap estimates of the aa distribution in grey.

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