SExtractor detection efficiency as a function of Rc-band surface brightness magnitude. Black diamonds refer to the complete sample of fake faint sources and blue triangles to deblended sources, see text for details. The dotted line corresponds to the sky surface brightness and dashed and dot-dashed lines to the surface brightness limits μ_V(z = 0) = 26.5; 27.5 after accounting for both surface brightness dimming and k-correction to transform them into Rc-band limits, see text for details.