Radial profiles of the Cosmic Snake (left panel) and A521 (right panel). The blue lines trace the ΣM_⋆ profile, the red and orange lines trace the ΣM_mol and ΣM_dust profiles, and the green and black lines trace the ΣSFR radial profiles from the SED fits and the Hα emission, respectively. We consider as detection a signal above 4σ for the ALMA data and above 2σ for the other data. We indicate with an upper limit the datapoint below the corresponding detection threshold.