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. 2015 Nov 7;187:732. doi: 10.1007/s10661-015-4943-2

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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. 3 — a The regression curves derived from the observed PAI beneath a single deciduous tree (site C). b The examples of sky view images in leafless season (on 11 March 2014) (1) and in full leaf season (on 11 June 2014) (2)