K and NB magnitudes (NB816 or NB921) from the optically selected sample and the non-detected SILVERRUSH sample. Limiting magnitudes (1σ) are given for sources below 1σ detection (filled and unfilled triangles for sources in the optically selected and non-detected SILVERRUSH samples, respectively). The histograms only include sources with a >1σ detection. The median K and NB magnitudes are indicated by the solid and dashed lines for the optically selected and non-detected samples, respectively. In the optically selected sample, 23% of sources are not detected in K above 1σ, while for the non-detected SILVERRUSH sample, this fraction is 82%. The optically selected sample is brighter and redder than the original SILVERRUSH sample.