Position on the Teff – log g plane of the stars in calibrating OCs including archival data analyzed in iDR4 (namely NGC 2243, NGC 6705, and NGC 3532) and colored according to their [Fe/H]. These stars were observed with the MW field and the OC setups. Of course, many more OC stars are observed with the OC setups alone (on the order of 20 000, see Table 1). The whole GES iDR4 sample is reported in the background as smaller gray dots.
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