Spectral comparison of 4C+19.71 to Cygnus A (Ogle et al. 1997). Blue histogram shows the same 1D spectrum as in Fig. 2. The spectrum of Cygnus A is shown in black which is extracted at its nucleus position after Galactic reddening correction and subtraction of a elliptical galaxy template. Both spectra are normalized to the peak flux density of their Hγ. The bottom panel is a zoom-in version of the region between the gray dotted lines in the upper panel. We marked the emission lines detected for 4C+19.71 with S/N ≳ 10 as in Fig. 2. The inset provides a further zoom-in around Hβ–[O III] complex.