Comparison of observations of the bow shock of ζ Oph with the VLA (left), Effelsberg (centre), and the mid-IR image from Spitzer Space Telescope MIPS 24 µm. All three images are plotted in units of megaJansky per steradian. The VLA and Effelsberg beams are plotted at the lower-left of the respective panels. For the VLA and Effelsberg plots, IR emission contours at levels 70 and 100 MJy sr⁻¹ are overplotted in dotted blue lines, and for Effelsberg and Spitzer plots the VLA intensity contours are overlaid in black, showing only the detected point sources.