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. 2020 Feb 18;21:169. doi: 10.1186/s12864-020-6579-z

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© The Author(s). 2020

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. 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.

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Fig. 1 — Heat map of essential oil content (a and b) and principal component analysis (OPLS-DA) plot (c) of data from essential oil of two different kind flowers from German Chamomile (MC) and Roman chamomile (CN) detection by GC-MS. MC_DF: Disk florets of German chamomile; MC_RF: Ray florets of German chamomile; CN_DF: Disk florets of Roman chamomile; CN_RF: Ray florets of Roman chamomile. The scale is a relative scale (peak area of compounds/ peak area of ethyl caprate), and the used ethyl caprate was used as internal standard to calculate the relative content of essential oil components in German and Roman chamomile.