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. 2021 Jan 11;22:5. doi: 10.1186/s12860-020-00339-1

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Summary of results from the outer plexiform layer (OPL) across all ¹⁵N-labelled treatments. a OPL ¹⁵N/¹⁴N ratios were obtained from both ONL and INL images. The dashed lines show typical sampling locations for the OPL. b Average ¹⁵N/¹⁴N ratios across all ¹⁵N-labelled treatments in the OPL. Error bars represent 1 standard deviation (1σ)