Open Access
Fig. 6.
vs. 
relation for stars monitored for more than five years. The solid black line is the best fit. Green stars, red triangles, and black circles are solar twins with ages t ≤2 Gyr, 2 < t ≤ 6.5 Gyr, and t > 6.5 Gyr, respectively. The blue dashed line stands for solar activity mean and dispersion.
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.