HST/FOC polarization maps of Cygnus A, observation ID 6510 through filter F342W. Left: Intensity map. Right: Debiased polarization degree. Both maps were resampled to 20px×20px (corresponding to 0.28″×0.28″), smoothed with a Gaussian with an FWHM 1.5 times the size of the resampled bin size (0.42″). 16 pixels have [S/N]_P ≥ 3. The orange cross displays the estimated location for the obscured nucleus (Jackson et al. 1998).