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. 2016 May 24;408:5457–5465. doi: 10.1007/s00216-016-9642-5

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Blank cheese samples spiked with SEA at 0.1 ng/g (blue diamonds) and 0.25 ng/g (red triangles). Performance of analysts (A–C) over time (measurement days 1–3) and overall performances. The error bars represent the variability of the four independent analyses per analyst and day (24 independent data in case of the overall values)