Fig. 4
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Hardness ratios of the stars from the M 10PC-GAIA SAMPLE that are detected with XMM-Newton (filled black squares), with the CH star (in blue) highlighted. Superposed on the data is a grid of 2T-APEC models with a fixed kT1 at 0.1 keV, kT2 and EM2/EM1 ranging from 0.1 keV to 0.9 keV and 0.2 to 12, respectively (see Sect. 4.2.1 for more details).
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