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.
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