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Fig. 4
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EW(Brα) versus EW(Brγ). Red symbols are for group I stars, group II stars are plotted in blue, and green symbols are for the intermediate group I-II. The relations EW(Brα) = 3 EW(Brγ) and EW(Brα) = 5 EW(Brγ) are plotted in continuous and dashed lines, respectively.
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