Tomogram and eigenspectrum 3 of the PCA tomography applied to the 6200−6700 Å spectral range. The anti-correlation between the red and the blue wings of the [N II] and Hα emission lines associated with a bipolar structure seen in the tomogram is a typical signature of gas kinematics. In the tomogram, the structure in blue (red) corresponds to the blue (red) wings of the [N II] and Hα emission lines. In this case, we interpreted this kinematics as a gas disc with PA = −3° ± 1°. The white circle marks the position of the AGN as given by the image of the broad component of Hα, and the white arrow corresponds to the direction of a resolved nuclear radio jet with PA = 65° (Martí-Vidal et al. 2011).