Left and center panels: Two portions of nuclear spectrum of 3C 313 extracted from a circular aperture 0$\stackrel{″}{.}$6 of radius, including both nuclei. The middle panel covers the region of the Hβ and [O III] λλ4959,5007 lines: all these lines show a double-peaked profile. In the left panel, we show the spectral region including the [O II] λλ3726,3729 doublet and the [Ne III] λ3870 line. The [O II] line shows a single profile. The right panel compares the nuclear spectrum with that extracted 1$\stackrel{″}{.}$4 ENE of the northern nucleus. The thick vertical segments mark the expected wavelengths of the emission lines based on the redshift derived from the stellar emission. Both the [O II] line and the red component of [O III] have a redshift consistent within the errors with the value derived from the starlight.