PdBI 1.3 mm continuum images towards AzTEC16−30, annotated with the source designations (AzTEC17a, 17b, etc.). The images are shown with linear scaling, and the overlaid solid contours start from 3σ and increase in steps of 1σ. The white dashed contours show the corresponding negative features (starting from −3σ). Each image is centred on the phase centre position, i.e. the original AzTEC 1.1 mm centroid from Scott et al. (2008) marked by the plus sign. The dashed circle shows the primary beam FWHM of , while the filled ellipse in the bottom left corner shows the synthesised beam size. The images are not corrected for the primary beam attenuation.