Fig. 5
Two-color diagram for the stars with SDSS color classifications. The color indices have been corrected for reddening as described in Schlafly & Finkbeiner (2011). Stars classified in this way as sdOs are marked in blue, sdBs in green and composite sd+MS systems in red. Upper panel: stars with spectroscopic classifications. The color cuts in the lower panel are determined from this plot. It can be clearly seen that composite systems are easier to identify from their colors than from their spectra.
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