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The selective abundance of C, N, O (almost solar) with respect to that ofother elements (underabundant) in lambda Boo stars has been interpreted as acharacteristic peculiarity of these objects, when considered as single stars.We show here that a similar selective abundance is predicted from the compositespectra resulting from two unresolved stars in the same temperature range asthe lambda Boo stars.Comment: Accepted for publication on A&

C, N, O in $\mathsf{\lambda}$ Boo stars and in composite spectra