Postage-stamp images for the X-ray sources that, among the four optical/IR band explored, have a counterpart only at 4.5 μm. The cyan circles (r = 1.5″) mark the MIR position of the counterpart, while the black contours show the X-ray full-band contours at different significance levels: 3, 5, 10, 20, and 100σ. Each image is 20″ on a side and is centered on the X-ray centroid. The catalog XID is shown at the top of each image.