SDSS/2MASS color–color summarizing the photometric properties of the selected candidates (blue dots) compared to field sources (black dots). The color–color space of the selected sample coincides with that of unreddened M dwarfs. Also shown for each color–color space are the reddening vector for AV = 1 mag (black solid line) (Cardelli et al. 1989) and the main sequence (red dashed line) from Covey et al. (2007).
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