This article has an erratum: [erratum]

Issue
EPL
Volume 97, Number 3, February 2012
Article Number 39003
Number of page(s) 6
Section Geophysics, Astronomy and Astrophysics
DOI http://dx.doi.org/10.1209/0295-5075/97/39003
Published online 06 February 2012

© EPLA, 2012