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. 2016 Jun 22;6:28426. doi: 10.1038/srep28426

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Synthetic data and simulated, fitted responses based on the three pairs of responses shown in Fig. 1 (a–c) along with values of degree of return (R_r), return time (R_t), rate of return (R_g) and efficiency (R_e) estimated from these fitted responses. Boxplots show the median (central mark), interquartile range (box) and range (whiskers) with outliers excluded.