Spectral energy distribution of the high-redshift dusty galaxy ACT-S J065207-551605. The colored measurements identify the ACT (red), SPT (orange), APEX (blue) and Herschel (green) data from Table D.1. The ACT measurements (red dots) correspond to flux densities from the COADD analysis. Grey points identify flux densities with signal to noise ratio lower than 3. The black dashed line corresponds to the modified blackbody function for a single-temperature, while the gray "shadow" is the uncertainty at 1 σ. The obtained photometric redshift z = 4.0 ± 0.8 is presented in the bottom-right corner.