NIR to radio SED of XS55, fitted using STARDUST (Kokorev et al. 2021). The total SED (black) is shown with its different components: stellar (blue), dust (red), and radio (magenta). An optically thick MBB (Magdis et al. 2012), fitted with mercurius (Witstok et al. 2022), is shown with a green line. The MBB is not accounted for in the total SED fit. The radio component was extrapolated using the stellar-mass-dependent IR-radio relation from Delvecchio et al. (2021). The NIR PDF(z) of XS55 is shown as an inset with the spec-z marked by a vertical red line.