The sample of Xue et al. (2008) in the u − g,g − r plane, with DR7 data. BHB stars (according to Xue et al.) are shown as red crosses, non-BHB stars as black points. The box shows the colour cut used by Xue et al. (2008) and Yanny et al. (2000). The outer boundary extends 0.1 mag beyond this. Sources outside the plot region were discarded.
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