Thumbnail images of the optical/NIR counterpart for each ALMA >5σ source. Image sizes are 9′′×9′′. From left to right, the columns denote HST filters F435W, F606W, F814W, F105W, F125W, F140W, and F160W, Spitzer IRAC filters 3.6 μm and 4.5 μm, and lastly a color image composed of HST filters F814W (blue), F105W (green) and F160W (red), with green contours denoting 1.1 mm emission detection at 4, 6, 8, 10, and 12σ. Red circles are centered on the ALMA centroid position and denote the search radius employed (1.̋1 for A2744, and 2.̋3 for M0416 and M1149). As described in the text, A2744-ID02 has multiple counterparts, we used the counterpart highlighted by the red circle to estimate its SED.