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. 2018 Feb 7;8:2590. doi: 10.1038/s41598-018-20996-9

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© The Author(s) 2018

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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Select electropherograms obtained from the PCR amplification and subsequent CE-analysis of raw opium samples (top-primer N263, middle-primer N565, bottom-primer N571). X-axis is fragment size in bases and Y-axis is relative fluorescent units. Note, a free-dye artifact is present at approximately 160 bases; this is independent of the sample and can be disregarded from analyses.