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. 2015 Jun 17;77(7):61. doi: 10.1007/s00445-015-0942-y

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© The Author(s) 2015

Open Access This 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.

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Fig. 9 — Percentages of number of closed contours obtained for different thicknesses using sub-sampled measurement datasets of different sizes for: a Fogo member A deposit; b Askja 1875 Layer D deposit; and c Taupo Plinian Pumice deposit. For each subset size, the sample number of data points were randomly selected from the complete dataset fifty times, interpolation was applied and a thickness contour map was produced allowing a count of number of closed contours (colored lines represent contour thickness in cm)