Clumps representative of the three typical mid-IR morphologies discussed in the text (from left to right: compact, extended, and complex). Upper panel: WISE three-color composite images (4.6 (blue), 12 (green), and 22 μm (red)). Lower panel: GLIMPSE IRAC three-color composite images (3.6 (blue), 4.6 (green), and 8 μm (red)). Gray contour lines indicate 870 μm dust continuum emission from the ATLASGAL survey. The red circles and cyan triangles are 5 GHz CORNISH sources and 1.4 GHz NVSS sources. The white circles are centered on the pointing positions used for our Mopra and IRAM observations and their diameters approximate the FWHM beams size of these telescopes in the 85–100 GHz range. The ATLASGAL beam has a size of 19′′ FWHM.