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Fig. A.2
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X-ray stacked spectra for the optically-bright M dwarf stars (orange: mG < 10), optically-faint (blue: mG > 10) M dwarf stars, optically-bright FGK dwarf stars (green: mG < 5) and optically-faint (violet: mG > 5) FGK dwarf stars. The middle and bottom panels display the ratio between the two groups of spectra.
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