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Mean non-parametric profile (red line) with 3-σm range (gray shading), obtained by averaging all daily F10.7 values for SN within a narrow band centered on the SN in the bottom axis (see details in the main text). Gray dots are the daily observed values. The number of data points strongly decreases above SN = 300 and F10.7 = 250 sfu, leading to a much larger SEM σm.
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