Left: F356W-F444W colors of the SWIRE library templates (Polletta et al. 2007) dust-attenuated following the (Calzetti et al. 2000) law for different reference redshifts vs. A_v. Each colored region spans the variability of the templates within the library. The orange horizontal dashed line indicates the observed 1σ lower limit for Capotauro’s color, while the dashed black line represents the 3σ estimate. The shaded gray areas mark the color space incompatible with the observed constraints. Right: Same, but for the F444W-F770W color. The orange and black dashed lines represent the observed 1 and 3σ upper limits for Capotauro’s color.