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Relationships between lateral and parent diameter illustrated for three different species (A, Lactuca seriola; B, Lamium amplexicaule; C, Solanum nigrum). The solid lines represent the trends between these variables (calculated by the ‘LOESS’ smoother of R). The bisecting line (dashed line) is also drawn, as well as the point with co-ordinates (Dmin, Dmin), to show that the trends would intersect the bisecting line near this particular point.
