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. 2019 Jul 8;14:119. doi: 10.1186/s13014-019-1326-9

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© The Author(s). 2019

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 — Esophageal cancer cell lines show heterogeneous survival after photon and particle irradiation. Clonogenic survival curves of OE19 and OE33 adenocarcinoma and KYSE270 and KYSE410 squamous cell carcinoma cell lines after photon (X), proton (¹H), carbon ion (¹²C) and oxygen ion (¹⁶O) irradiation (mean ± SD of 3 independent experiments). The table depicts the relative biological effectiveness (RBE) for ¹H, ¹²C and ¹⁶O radiation at 10% survival