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Fig. 31.
Ratio O I (7744 Å) and Mg II (4481 Å) versus the EW of O I. The orange dots mark stars which were previously classified as λ Boo stars; the green dots mark new λ Boo candidates; and the blue dots mark the stars with normal abundances. The vertical dashed line delimits the locus of bona fide λ Boo stars (see text).
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