Fig. 9.
Comparison of equatorial coordinates between SDSS and Gaia with respect to magnitude and redshift. Grey dots show the (3D) diagram of position offsets between the Gaia-DR2 and SDSS with respect to the redshift and magnitude for the quasars in common in the two catalogues. Empty black squares show the associated projected diagram (2D) along the redshift axis. Empty black diamonds show the associated projected diagram (2D) along the magnitude axis. Bottom panel: right ascension cosine declination part of the offsets. Top panel: declination part of the offsets.
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