Fig. 4
Estimating the flux density (Sf) and size (θd) of the source using the brightness distribution models introduced by Pearson (1995): for the first three epochs, an extended source model could be used, whereas for the last epoch, a double-point source model with an intensity ratio of 3:1 and an angular separation of 0.16 mas were 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.