Fig. 2.
Colour-magnitude diagram (g versus g − r) for the SDSS9 optical counterparts of the X-ray sources (black data points with source No. as labels). Orange dots represent the SDSS7 members (g < 23 mag) of the Draco dSph as classified by Rave et al. (2003). The red line is the stellar isochrone for the age of 10 Gyrs and metallicity of 0.0004 solar metallicity of the Draco dSph according to Girardi et al. (2004).
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