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. 2016 Jul 4;5(1):979. doi: 10.1186/s40064-016-2618-2

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© The Author(s) 2016

Open AccessThis 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. 3 — Cluster analysis of mineral elements in D. officinale. Cluster analysis was performed using the Ward’s method, and the cultivars were mainly classified into three clusters. Similarities on the quantification of mineral elements were noticed in each cluster