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Extracted ion chromatograms (m/z values in parentheses) from comprehensive 2D gas chromatography analyses of house dust, illustrating the ordered elution patterns of three homologous series of dust contaminants: a aliphatic (n-alkyl) acids (m/z 60), b aliphatic (n-alkyl) aldehydes (m/z 82), and c cyclic aliphatic lactones (n-alkyl furanones) (m/z 85)
