a) Velocity shift of the blue- and redshifted [OIII] component with respect to 5007 Å (dashed line), detected in the “off-nuclear” spectra of J1201+1206 extracted from different apertures. Negative(positive) pixel values correspond to south(north) direction (1 pixel ~1.9 kpc at the redshift of J1201+1206). b) The ratio between the integrated flux of the two [OIII] components (i.e. the broad component at 5007 Å and the blue- and redshifted component) and the BLR Hβ emission for the “off-nuclear” spectra of J1201+1206. The yellow bands highlight the presence of extended [OIII] emission. c) Maximum velocity of the broad [OIII] component at 5007 Å and the blue- and redshifted [OIII] component detected in the “off-nuclear” spectra of J1201+1206.