Free Access

Fig. 3


Highest redshift quasar of the SDSS-DR10 quasar catalog is shown in the upper left panel. Note that this quasar was already in DR9Q. The three other panels show typical examples of quasar spectra at different redshift.

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.