Upper panel: distribution of the apparent r′-band magnitudes of in FCC (the blue histogram), compared to the ones detected in this work. We show the distribution of the galaxies classified as likely cluster dwarfs with the red histogram and the one of the likely background galaxies with the black histogram. Lower panel: same distributions in a cumulative profile. The FCC magnitudes are transformed from the B-band to r′-band using the mean color difference of ⟨B − r′⟩ = 1 mag defined comparing our values with the ones of FCC.