True colour images, created using the 3.6, 4.5 and 8.0 μm Spitzer/IRAC mosaics of all the groups in our sample. The green and red (when available) contour maps are the 250 μm Herschel/SPIRE and the VLA/HI moment-0 maps of the same groups. The six contours correspond to 3, 5, 7, 9, and 20σ. In the bottom right corner of each panel we present the size of the SPIRE 250 μm and VLA band beams, respectively. The RA and Dec scales of the axes are in J2000.0 coordinates.