K-band and 3.6 μm cutouts of the 15 XMM-CDFS sources not previously detected by Chandra (images from the MUSYC and SIMPLE surveys). The XMM-Newton contours from the 2 − 10 keV band (5 − 10 keV for sources 1098 and 1149) are superimposed in blue. A green circle with radius 10″ is drawn around the XMM-Newton position. The first, third and fifth rows show K-band images; the second, fourth and sixth rows show 3.6 μm images. From left to right, and from top to bottom: ID210 5, 85, 176, 186, 189, 207, 224, 280, 348, 381, 402, 407, 410, and ID510 1149, 1150. K-band data are not available for ID210 407 and 410. Each cutout covers an area of 40″ × 42″. The K-band images have been smoothed with a Gaussian kernel of size 3 pixel (0.75″). The images are shown in histogram-equalized scaling, ranging from light (fainter fluxes) to dark brown (brighter fluxes).