Luminosity function of the galaxies of RX J105453.3+552102 within 1 Mpc (top panel) or 0.5 Mpc (bottom panel) radius, respectively. In all panels, the black points represent LF_phot calculated by the statistical subtraction of galaxy counts obtained from the literature. The red squares represent LF_phot in which the background counts were obtained using the photometric redshift from SDSS. The green diamonds represent LF_spec.