NED object is Cygnus A; Reference is 1984MNRAS.209..851A

   Figure lbb. Maximum entropy maps of the hotspots with superimposed E
 vectors, whose magnitudes are proportional to the polarized brightness.
 Contour levels: 0.4, 0.6, 0.8, 1.0, 1.5, 2.5, 5.0, 7.5, 10.0 Jy per pixel
 (pixel size 1.5 X 1.5 arcsec**(2). A bar indicates the vector scale in Jy per
 beam. The coordinates are for 1950.0 in all of the maps.