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. 2020 Mar 25;10:5436. doi: 10.1038/s41598-020-62338-8

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Characteristic single spectra for the two groups (a,b) and examples for SERS spectra of the two groups containing (c,d) and not containing (e,f) the respective characteristic spectrum. The parameter w displays the proportion of the respective characteristic single spectrum in the SERS spectrum. This figure was generated using the software R³³ (version 3.5.2).