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Cover: Difference images of lupine root structure and water distribution created by background subtraction, median filtering, and then binarization, from “Quantitative Imaging of Infiltration, Root Growth, and Root Water Uptake via Neutron Radiography,” p. 1035–1047, by Sascha E. Oswald, Manoj Menon, Andrea Carminati, Peter Vontobel, Eberhard Lehmann, and Rainer Schulin. The article is part of this issue's special section, Roots and Root Function, edited by Todd Skaggs and Peter Shouse.