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RST frequency histogram for the six soil composites. RST frequency is plotted on a logarithmic scale against abundance class. Singletons, doubletons, and predominant RSTs are indicated within the graph area for convenience. Dark bars indicate boreal forest soil samples. Sample locations are Alert (AL), Nadluardjuk Lake (NL), Cape Dyer (CD), Montmorency (MM), Narrow Hills (NH), and Peace River (PR).
