Best SED fits obtained with CIGALE on the stacked photometry (open circles) at z = 6.2. Top panel: Fit including only galaxy templates. Middle panel: Fit including both galaxy and AGN templates. The fitting from the AGN run is strongly favored based on χ² arguments and ALMA constraints. Bottom panel: Decomposition of the AGN-dust template (dashed red) in three multi-temperature graybody models (dot-dashed lines). The normalized BH-star SED (Naidu et al. 2025) is overlaid for comparison (green) and not included in the SED fitting. Details are given in Section 4.1.