Fig. 1
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The V magnitude (left panels) and B–V color (right panels) distribution of the Landolt (top panels) and Stetson (bottom panels) collections. The full samples are plotted in grey, the samples with a match in Gaia EDR3 in light colors, and the best-quality samples (see Sect. 4.1 for details) in full colors. The dotted vertical lines show the coverage of the original Landolt (1992) standards set.
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