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. 2019 Feb 27;9:2933. doi: 10.1038/s41598-018-37588-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) PA imaging to monitor the changes in amplitude of the PA signal with increase in the surrounding temperature. (a) Plot indicating normalized amplitude of the PA signal obtained versus surrounding temperature, blue dots indicate measurements and the red dashed line represents the linear fit. (b) PA images of the fiber tip at different surrounding temperature. The increase in PA amplitude as well as the effect of speed of sound variation can be clearly seen in (b).