NED object is Cygnus A; Reference is 1984MNRAS.209..851A Figure 2ba. Maximum entropy maps with superimposed E-vectors. Contour levels: 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 Jy per pixel (pixel size 0.75 X 0.75arcsec**(2). A bar gives the scale of the polarized brightness in Jy per beam. The coordinates are for 1950.0 in all of the maps.