Open Access
Fig. 4.
Download original image
Structure functions for Mrk 421 UV (far left), Mrk 421 X-ray (centre left), Mrk 501 UV (centre right), and Mrk 501 X-ray (far right). After 2000 days these are badly affected by systematics, so peaks right of this value should not be trusted. Only Mrk 421 X-ray appears to reach saturation.
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.