Fig. 1
Data selection: spectroscopic surveys used for the red giants (APOGEE stars – data release 13, left) and the main sequence (LAMOST stars – data release 2, right) analysis. Black points represent stars in each data release, red points are objects in the first sample selection, used to differentiate red giant stars from dwarfs and vice versa. Green points represent a 1000 star sample selection we used to measure the extinction coefficient.
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