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Size distributions of 13 protist species as functions of the equivalent (Eq.) diameter (i.e., the diameter a cell would have if it were spherical). (Left to Right) Photographs show individuals of the species E. gracilis, Colpidium sp., and P. bursaria. (Scale bar: 100 μm.) The legend links each color to the corresponding species. (Protist photographs provided by Regula Illi, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dü\x{0308}bendorf, Switzerland, and F.A.)
