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. 2017 Sep 20;3(9):e1700906. doi: 10.1126/sciadv.1700906

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — (A) Schematic diagram illustrating how the parameters δ₁(0) and δ₁(τ_env) are derived from an isotopic time series δ₁(t). The time scale τ_env represents the duration of time during which the isotopic composition δ₁ decreases. (B) Histogram depicting the distribution of events in time.