This article has an erratum: [erratum]

Issue
EPL
Volume 107, Number 2, July 2014
Article Number 21001
Number of page(s) 5
Section The Physics of Elementary Particles and Fields
DOI https://doi.org/10.1209/0295-5075/107/21001
Published online 14 July 2014

© EPLA, 2014

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