Multiwavelength views towards AzTEC16−30. The panels from top left to bottom right for each source are as follows: PdBI 1.3 mm, VLA 20 cm, VLA 10 cm, Spitzer 24 μm, Spitzer 8 μm, Spitzer 3.6 μm, UltraVISTA YJHK_s colour composite, and HST/ACS I-band. The overlaid 1.3 mm contours are as in Fig. 1, and positive 1.3 mm contours are shown in all panels. The synthesised beam of the PdBI data is shown in the bottom left corner in the first panel for each source. A scale bar indicating the 1″ projected length is shown in the PdBI panel, and the corresponding proper length [kpc] at the indicated redshift is also denoted (except when only a lower limit to z could be derived). The catalogue positions of the Herschel/SPIRE 250 μm sources are marked with plus signs in the PdBI images towards AzTEC19, 20, and 24. The diamond symbol in the PdBI image towards AzTEC24 indicates the position of the ASTE/AzTEC 1.1 mm source AzTEC/C48 from Aretxaga et al. (2011).