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. 2017 Jun 28;4(6):170331. doi: 10.1098/rsos.170331

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© 2017 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Stable oxygen isotope values (δ¹⁸O_MW) derived from Soro Mik'aya Patjxa human bone (grey bars) compared with modelled δ¹⁸O_MW values for surface water in the Andes (curves) as compiled by Knudson [20]. Solid curves indicate Altiplano water sources approximately 3800 m.a.s.l. The dashed purple line reflects the range of values reported for the mid-elevation Yungas environments, 500–2300 m.a.s.l. The Soro Mik'aya Patjxa samples exhibit values significantly lower than Yungas water but securely within the range of variation for Altiplano surface water. Reported bone values include corrections for well-known fractionation effects (see the electronic supplementary material).