Comparison between the average values of SCa II, Hα , Na i, and He i for the 23 stars with values of S index. Errorbars are the standard deviations, the dashed line the best linear fit, ρ is the Pearson correlation coefficient, and N the number of stars used.
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.