J − NB118 versus Y − J for all objects with a 5σ NB118 detection in the stack and at least a 2σ detection in the two broadband filters. Orange crosses give the median of J − NB118 for all objects within equidistant Y − J bins. The solid red line is the assumed color correction (cf. Eqs. (F.1) and (F.2)), meaning that we defined objects on this line to have a J_corr − NB118 of zero. The J − NB118 = − 0.25(Y − J) line (Eq. (F.1)) is also shown beyond Y − J> 0.5, but there as dotted line.