Fig. 2

Sky location of the different photometric and spectroscopic surveys used in this study. Top panel: overview of the whole sky in an Aitoff projection in J2000 equatorial coordinates; the WISE photometry covers the whole sky. Bottom panel: zoom on the location of eboss6-7, the ten eBOSS/ELG test plates observed in 2014; in this study, we do not use eboss6 measurements outside of the eboss7 area.
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.