Relation between the N2CLS color and the redshift for various SED models. The grey solid line and the associated contours represent the median color of SIDES galaxies and the 16–84% dispersion. The solid and dashed colored lines (red for 25 K, green for 35 K, and blue for 45 K) correspond to modified black bodies with β= 1.5 and β= 2, respectively. The horizontal lines show the sensitivity ratio in COSMOS (dot-dash line) and GOODS-N (dotted line).