Fig. 16
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XMM-Newton versus K2 flare energy of the M stars from Guarcello et al. (2019), Table 4 and Kuznetsov & Kolotkov (2021), Table 2. The red line displays a linear fit taking into account uncertainties in both EX and EK2. EK2 was shifted to minimize the error of the y-axis offset. The orange area comprises fit uncertainties in y-axis offset and slope. See Sect. 5.1.2 for details.
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