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Relationships between interbranch distance and diameter of the mother root for three different species. (A) Anisantha sterilis; (B) Poa pratensis; and (C) Arrhenatherum elatius. The thick solid lines represent the trend between these variables (calculated by the ‘lowess’ smoother of R). The three graphs illustrate the three cases that we observed: (A) decrease in interbranch distance with mother root diameter; (B) independence; and (C) slight increase.
