Free Access
Volume 541, May 2012
Article Number L8
Number of page(s) 4
Section Letters
Published online 15 May 2012

Online material

Movie star1 (Access here)

Movie star2 (Access here)

Movie wwsn_presn1.avi (Access here)

Movie wwsn_sn1.avi (Access here)

Movie wwsn_postsn1.avi (Access here)

Movie wwsn_sn2.avi (Access here)

© ESO, 2012

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.