Raster intensity maps corresponding to the nominal positions of the Mg II k3, k2v, k2r spectral features, the Mg II triplet, and the Si IV 140.3 nm line, for three time steps around the maximum intensity peak of the UV burst. The solid orange contours delimit the UV burst as seen in the Si IV intensity, while the dashed orange contours mark the boundaries of the burst as seen in the Mg II triplet line feature. We have applied a gamma adjustment to the Si IV color table.