Fig. 4.
Colour–colour diagram of mid-infrared WISE W1 (3.4 μm)−W3 (12 μm) colour index versus near-infrared 2MASS J − K colour index for the counterparts of X-ray sources in the field of the Draco dSph detected by XMM-Newton. Dash-dotted lines separate the regions, which are occupied by the counterparts of background sources from that of the others (Fig. 3, Saeedi et al. 2016).
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