Open Access
Volume 24, Number 6, November-December 2017
Article Number A601
Number of page(s) 8
Published online 10 November 2017

© E. Agomuo et al., Published by EDP Sciences, 2017

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