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. 2016 May 18;7:683. doi: 10.3389/fpls.2016.00683

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Copyright © 2016 Carrer, Brunetti and Castagneri.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Tree-ring anatomical profiles during a cold (1926, the first year with an extreme cold June in the 1926–2011 period) and a warm (1931, the first year with an extreme warm June in the 1926–2011 period) year in a spruce (PA04) and a larch (LD04) tree. X-axis represents the relative distance from the ring border, and the corresponding sector (upper axis and different colors). Dots are individual cell values, solid and dotted lines represent the mean and standard deviation values. Note different Y-axis scales for the four anatomical traits.