Maps of the Mg II k Doppler shifts for three different time steps. For each time there are three panels representing the shifts with respect to the rest wavelength of the k3, k2v, and k2r features of the Mg II k line. The color table on the left relates to the k3 spectral feature while the color table on the right refers to the k2v and k2r features. The solid black contours delimit the UV burst as seen in the Si IV intensity, while the dashed black contours mark the boundaries of the burst as seen in the Mg II triplet line feature.