Mean pixel-by-pixel z, r, and g band fluxes (RGB mapped) within 15 × 15 binned embedded space. The number of sources within each bin contributing to the mean is shown in white in the upper left side of each image. The red dashed lines highlight a region with the highest number of known quasars, with a zoom-in binned embedded space on the right side. The number of known quasars in each bin at the zoom-in plot is shown in orange, below the number of sources in white.