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Figure S1. Radial increments for 1992–2008 for combined male and female cottonwood trees. Separate increment cores were extracted from the north, southeast and southwest sectors. Mean ± SE, n = 31.

Figure S2. Δ13C of annual wood rings of individual male and female cottonwoods along the Oldman River for 1994–1996 (high flow), 1999–2001 (low flow) and 2006–2008 (intermediate flow). Values within the 3 year periods linked by solid lines and dashed lines indicate intervals where δ13C was not measured.

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