Comoving volume number density of red galaxies n_V,r and mean luminosity ⟨L⟩/L₀ of red galaxies as a function of limiting magnitude r_lim and redshift z. Left panel: comoving volume number density of red galaxies n_V,r in units of 10^-4   Mpc^-3. Contour values range between 10^-3 in the upper left and 50 at the bottom. In the upper left corner of the panel n_V,r ≈ 0. Right panel: mean r band luminosity. Contour values range between 0.16 in the lower part to 5 in the upper left corner. In both panels the red dashed line marks the values for r_lim = 25, the limiting magnitude we employ in our calculations. Decades in contour values are indicated by the black solid lines.