Top: 2D spectrum of SDSS143417 around the Hα[N II] region, with gray contours tracing flux levels and blue crosses marking the positions used for Gaussian fitting. Bottom: 1D spectra extracted with different apertures: the ESO pipeline, 30 px/side, including both knots (blue), IRAF/apall, 5 px centered on the brightest knot (orange), and IRAF/apall, with asymmetric aperture sampling the secondary knot (green). Vertical dashed lines indicate the wavelength ranges where the 2D contours reveal asymmetries, serving as guides to identify additional kinematic components.