Panel a: r vs. r−i diagram of all the objects selected as M-type stars (gray symbols). Black dots show those whose r magnitude is brighter than the limit indicated by the dashed line, while red squares indicate the subsample including M-type for which the AV values are not consistent with solar metallicity giants. The reddening vector is also indicated. Spatial distribution (panel b) and σ(AV)l vs. the ⟨AV⟩l values of bright M-stars, obtained assuming the giant locus (panel c) and the MS locus (panel d). The median and the median ± the pseudo-sigma are indicated by the solid and dashed lines, respectively, in panels c and d.
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