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The first canonical discriminant function used to classify volatiles collected from the headspace of B. oleracea plants undamaged (circles) or infested with 5 (triangles), 10 (squares) or 20 (diamonds) P. xylostella larvae for 72 h prior to volatile collection (n = 5). Large symbols indicate the discriminant function of the group centroid for each treatment and smaller symbols indicate the functions for each data point within that particular treatment.
