Open Access
Volume 24, Number 1, January-February 2017
Article Number N101
Number of page(s) 4
Published online 17 February 2017

© V. Duflot, Published by EDP Sciences 2017

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License CC-BY-NC (, which permits unrestricted use, distribution, and reproduction in any medium, except for commercial purposes, provided the original work is properly cited.

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