Optical spectrum of quasar SRGE J170245.2+130107 (discovered by SRG/eROSITA) obtained with theBTA 6-m telescope. The light gray and dark gray lines show the spectra obtained on August 17, 2020, and September 13, 2020, respectively, while the combined spectrum is shown by the black line. The red dots show the source flux density in the Pan-STARRS r, i, z, y filters. The vertical dashed lines show the expected positions of the peaks of the emission lines of the quasar at z = 5.466. Adapted from Khorunzhev et al. (2021).