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Fig. 7
Distribution of the X-ray luminosity in the energy band 0.2–2.0 keV, for the 102 main-sequence stars of the Kepler - XMM-Newton sample (hatched histograms) and for the NEXXUS stars from Schmitt & Liefke (2004) (solid line) for each spectral type class separately and for all spectral types combined.
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