Left: A3365 WSRT 1382 MHz image. Contour levels are drawn as in Fig. 1. Right: A3365 X-ray emission from ROSAT in orange. The original image from the ROSAT All Sky Survey was convolved with a 225″ FWHM Gaussian. Solid contours are from a VLA 1.4 GHz image with compact sources subtracted from the uv-data. This DnC array image has a resolution of 47″    ×    42″. Contours are drawn at levels of  [1,2,4,8,...]  × 0.4 mJy beam^-1. Dashed contours show the galaxy iso-density distribution derived from INT images. Contours are drawn at  [1.0,1.1,1.2,...]  × 0.78 galaxies arcmin^-2 selecting only galaxies with colors 0.6 < V − R < 0.9, 0.54 < R − I < 0.84, i.e., within 0.15 mag the V − R and R − I color of the largest cD galaxy.