IRIS spectra surrounding the Si IV lines at 1393 Å and 1402 Å using a 30 s exposure. Upper panels show the absorption spectra taken at 12 October 2013 01:42 UT. The lower panel uses the fluorescent emission spectra with an inverted colortable (bright lines are black). The horizontal red lines show the location and width of molecular emission lines and are overlaid on the absorption spectra. The green profiles show the spectra (median filtered along the slit) of the region of the interest. The color table is logarithmic. An animated version of the absorption spectra is presented in the online edition of the journal. Each raster step moves 0.35′′ westward.