Map of the large-scale environment of the 1RXS J235814.4+ 150524 fossil group (blue disk). Black dots are the known galaxies within the redshift range [0.16; 0.195]. The black circle shows the only galaxy less than two magnitudes fainter than the dominant galaxy. Red circles are the known compact galaxy structures (groups or clusters) in the same redshift range. Units of the figure are decimal degrees relative to the group center.