Left: Sequence of average SEDs for increasing luminosity, scaled by their total luminosity between 1000 Å and 1 μm. The trend of decreasing NIR luminosity for increasing optical luminosity is apparent despite the small dynamical range, and it is testified by the decreasing R shown in the inset. Here the mean value (standard deviation) is shown as a black solid (dashed) line. Right: Sequence of average SEDs for increasing redshift, scaled by their total luminosity between 1000 Å and 1 μm. The different sampling of the rest-frame emission leads to slightly different SEDs. However, on average R does not show any evolutionary trend as we do not observe systematic departures from the mean value.