Fig. 2.
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Integral fluence spectra of AD774/775 event. Blue and black filled squares display the estimations based on the cosmogenic radionuclide data (Usoskin et al. 2021; Koldobskiy et al. 2023, respectively). While the magenta ribbon reflects the spectrum derived by Koldobskiy et al. (2023), the orange ribbon is obtained as a worst-case upper-limit integral-fluence spectrum based on an X600 solar flare by employing the method outlined in Papaioannou et al. (2023).
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