Overview of the Si IV spectra of the reconnecting filament. The left panels show the C II SJI images, overlaid with all eight slit positions as vertical dashed lines. The right panels show the corresponding eight Si IV spectra at each slit position. Prominent enhancements of the Si IV 1402.8 Å line, which can also be Doppler-shifted, are shown by blue and red arrows, respectively. Note the similar behavior of the O IV line at 1401.2 Å. An animation of this figure is available online (SJICII_SpectraSiIV_revised.mp4).