Free Access

Fig. 4


Combined Fourier power spectrum of data taken on June 17 and 18, 2012. The dashed lines mark the 3-σ level. In the upper panel, a new signature well above the 3-σ level appears at 1.2081 Hz, while the significance of the 2.5852 Hz one (the upper right panel in Fig. 3) decreases.

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.