Background-subtracted galaxy number density counts for the Coma cluster field after subtracting the reference-field contribution without applying a completeness correction. The blue points show the luminosity function without any color selection, the green diamonds show the sample after applying the quiescent color–color selection, and the red stars show the quiescent sample further restricted to galaxies within the adopted red-sequence selection. Absolute magnitudes are expressed on a Coma-equivalent scale, used as a common reference scale rather than a physical distance assumption.