Fig. 1.
Spectroscopic data set in equatorial coordinates. Data are taken from SDSS-DR15 + WISE totalling about 245 000 objects of which there are 86 412 stars (yellow), 83 119 galaxies (purple) and 75 955 quasars (green). The entire photometric data set is a sample of about 1 023 000 objects, of which 98% lack spectroscopic redshifts and classification.
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