This article has an erratum: [erratum]

Issue
EPL
Volume 89, Number 3, February 2010
Article Number 39002
Number of page(s) 6
Section Geophysics, Astronomy and Astrophysics
DOI http://dx.doi.org/10.1209/0295-5075/89/39002
Published online 17 February 2010

© EPLA, 2010