Fig. 8.
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Spectral index computed with Eq. (2) for MOS1 (continuous blue line) and PN (continuous red line) spectra of observation ID 0110980601. The dash-dotted lines indicate the 90% confidence level. For comparison, the spectral index relative to the 90% flux in the active magnetosphere given in Lotti et al. (2018) is indicated with the black line.
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