Upper panel: comparison between our system of MV – estimates (boldfaced numbers in Col. 9 of Table 1) and those as proposed by the calibrations from Walborn (1973). Lower panel: absolute magnitudes for the sample stars proposed by the calibrations of Walborn (1973) vs. similar data inferred from the calibrations by Martins & Plez (2006). Filled and open circles denote cluster and association members and field stars, respectively. On each plot, absolute values of MV were used, such that positive differences indicate objects that appear brighter in the first dataset compared to the second. Data points in red indicate confirmed SBs. For more information, see Sect. 1.
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