Fig. 3.
WISE colour-colour plot of all Gaia point sources (black dots), the subset with zero proper motions (blue dots), and spectroscopically confirmed quasars (red star symbols) within one degree of the NGP. Overplotted are contour levels linearly spaced in ten steps from 0 to 100% of the full SDSS-DR14 quasar sample with MIR counterparts in the AllWISE catalogue.
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