Comparison between radio, optical, and X-ray images of GK Per rendered in red, green, and blue, respectively, on logarithmic scales tuned to clarify features of interest. The radio data was taken by the B-configuration VLA in 1997 using the L-band receiver at 1.45 GHz. The optical data was by the WFPC2 instrument of the HST in 1995 using the H ﹩\alpha +﹩[NII] filter. The X-ray image is by Chandra in 2000; the same data as the panel (a) in Figure 1.