Relation between the mean versus model effective surface brightness and the total magnitude for all sources in the full SourceExtractor catalogue with I_E ≤ 22.96. Brown, orange, and yellow dots are for targets classified as stars consistently by six, five, and four independent criteria, respectively. Green dots are for galaxies with photometric redshifts from Phosphoros z_phot ≤ 0.1, red dots for optically identified cluster members, and magenta dots for spectroscopically confirmed cluster members (z_spec ≲ 0.03). The black solid line (⟨μ_IE⟩ = 0.783 I_E + 3 mag arcsec⁻²) delimits the region where most (13/899, 1.4%) of the spectroscopically and visually identified members are located.