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Fig. 6
Two-color diagrams for the stars with GALEX/APASS (upper panel) and GSC/2MASS (lower panel) color classifications. Because those stars are on average brighter and closer, no reddening correction has been applied. Stars classified in this way as sdO/Bs are marked in green and composite sd+MS systems in red.
This figure is made of several images, please see below:
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