(V − I) vs. (B − V) color − color diagram for stars in our field with UBVI photometry. The reddening vectors for the normal extinction law (RV = 3.1 and an anomalous one (RV = 4.0) are plotted with arrows. The the red dashed line represents the reddening-free Schmidt-Kaler (1982) zero age main sequence (ZAMS) relations for dwarf (LC V), while the blue is for giant stars (LC III).
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