Fig. 6
Distribution of subdwarfs as a function of their spectral indices. Symbols are as in Fig. 1. The bottom right plot shows the CaH2+CaH3 vs. TiO5 diagram for objects classified as sdM, esdM, or usdM (small diamonds in red, green, and blue, respectively) in the SDSS spectroscopic database. Plots originally presented in Gizis (1997) and Lépine et al. (2007), updated with our discoveries.
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