Position in a color–color diagram at different redshift bins of the HeViCS sources with photometric (black stars), spectroscopic (red stars) redshift, and reliable optical counterparts. The red solid line shows a reference curve for a modified black body with β = 2, 10 ≤ T ≤ 30, and the redshift equals to the average of the bin. Rhombus, triangles, and stars indicate a modified black body with β = 2 and temperature of 10, 20, and 30 K, respectively.