Fig. 7.
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X-ray luminosities in 0.3–8.0 keV vs. Teff of a sample of F stars similar to KELT-24 (star symbol) and WASP-18 (reversed open triangle). The names of the stars are reported in the legend. We added an upper limit of 26.5 for WASP-18 and the value obtained with the present data for KELT-24. XMM-Newton observed Tau Bootis A several times; for this reason, we indicate a range with a vertical segment.
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