Sky distribution for sample of 266 590 tracer quasars (1.77 <  z_q <  3.5) from DR14Q in J2000 equatorial coordinates. The solid black curve is the Galactic plane. The high-density regions are the eBOSS and SEQUELS observations (for the northern regions of the two Galactic hemispheres) and SDSS-stripe 82 (for declination δ ∼ 0). The discontiguous small areas contain only SDSS DR7 quasars.