Centroid radial velocities of Si II, Ca I, and Fe II lines (from Si IIv_sys = −60.7 km s⁻¹) and their distribution histograms. The error bars for Ca I and Fe II (shown in the corner) are larger than the errors for radial velocities from the Si II line, because the Fe II and Ca I lines are much shallower and therefore the results are more affected by noise. Snapshots of both line profiles can be seen in Fig. 13.