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Fig. 1

Colour–colour diagrams for galaxies, stars, and quasars from a cross-match of WISE × SuperCOSMOS with SDSS spectroscopic data. Left panel: WISE colours only; right panel: WISE and SCOS colours. Blue contours correspond to galaxies, red contours represent stars, and green contours illustrate quasars.
This figure is made of several images, please see below:
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