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. 2017 Apr 26;7:1181. doi: 10.1038/s41598-017-01277-3

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© The Author(s) 2017

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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Top: Relative transmission R( $ρ, θ, φ)$ evaluated with the best estimate of the tuff density ρ = 1.71 g/cm³; the black dots lie on the contour of one of the structures which are observed. Bottom: Projection of the black dots in the top figure at z = 25 m, corresponding to the ceiling of a known structure. The drawings were obtained using the software root and Autodesk AutoCAD 2015.