Free Access

Fig. 6


Phase diagram using a frequency of ν = 6.477 × 10-5 1/d (P1 ≈ 42.3 years). The data has been binned (red dots) and the binned data fitted with an akima spline (red line). A zero point offset in time of 3000 days was applied.

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.