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. 2017 Mar 14;12:52. doi: 10.1186/s13014-017-0783-2

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© The Author(s). 2017

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. 3 — Sensitivity of the FSF to the proton spot fluence fit parameters for an energy of 130.9 MeV at field sizes of 2 cm (a) and 20 cm (b)