Intensity plots of the non-detected targets listed in Table A.1. We use a saturated colour scale extending to negative values to show the noise level in the maps. The colour bar values are in milliJansky per beam. In the bottom right, a line that corresponds to 1^′ is shown, while in the bottom left, the cross-section of the synthetic beam’s FWHM can be seen. Contours of the most interesting features from the WISE 22 μm counterpart are overlaid with blue lines.