Mapping the Milky Way with Gaia Bp/Rp spectra - II. The inner stellar halo traced by a large sample of blue horizontal branch stars

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Fig. 1

u_std;0 − CaHK₀ versus g_std;0 − r_std;0 for previously spectrally confirmed BHB stars (blue points) and high surface gravity stars (orange points). Although there are some mixtures of these two kinds of stars in this color-color diagram, we can still make a rough separation of them by the dashed red lines.

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